Water, Land and Ecosystems - Book https://wle.cgiar.org/item-type/book en Global groundwater: source, scarcity, sustainability, security, and solutions https://wle.cgiar.org/global-groundwater-source-scarcity-sustainability-security-and-solutions <div class="metadata-field field-type"><strong class="label-above">Type</strong>Book</div><div class="metadata-field field-language"><strong class="label-above">Language</strong>en</div><div class="metadata-field field-author"><h2 class="label-above">Authors</h2><ul><li>Mukherjee, A.</li><li>Scanlon, Bridget R.</li><li>Aureli, A.</li><li>Langan, Simon J.</li><li>Guo, H.</li><li>McKenzie, A. A.</li></ul></div><div class="field-citation metadata-field"><h2 class="label-above">Citation</h2><div class="field-content">Mukherjee, A.; Scanlon, B. R.; Aureli, A.; Langan, Simon; Guo, H.; McKenzie, A. A. (Eds.) 2021. Global groundwater: source, scarcity, sustainability, security, and solutions. Amsterdam, Netherlands: Elsevier. 676p.</div></div><div class="metadata-field field-status"><h2 class="label-above">Accessibility</h2>Limited Access</div><div class="metadata-field field-research-theme"><strong class="label-above">Research Themes</strong><ul class="comma-list"><li><a href="/research/themes/variability-risks-and-competing-uses" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Variability, Risks and Competing Uses</a></li></ul></div><div class="metadata-field field-permalink"><h2 class="label-above">Permalink</h2><a href="https://hdl.handle.net/10568/111566">https://hdl.handle.net/10568/111566</a></div> Wed, 29 Dec 2021 12:41:38 +0000 Anonymous 19936 at https://wle.cgiar.org https://wle.cgiar.org/global-groundwater-source-scarcity-sustainability-security-and-solutions#comments Good practices for agrobiodiversity management https://wle.cgiar.org/good-practices-agrobiodiversity-management <div class="metadata-field field-type"><strong class="label-above">Type</strong>Book</div><div class="metadata-field field-language"><strong class="label-above">Language</strong>en</div><div class="metadata-field field-author"><h2 class="label-above">Authors</h2><ul><li>Joshi, Bal Krishna</li><li>Gauchan, Devendra</li><li>Bhandari, Bharat</li><li>Jarvis, Devra I.</li></ul></div><img typeof="foaf:Image" src="https://wle.cgiar.org/sites/default/files/Good_Practice_Joshi_March20.pdf_.jpg" width="225" height="300" alt="" /><div class="field-abstract"><div class="field-content">Native agricultural genetic resources have been generally under-valued, therefore, some initiatives have been taken through Global In-situ agrobiodiversity project joinly implemented by NARC, LI-BIRD and Bioversity International since 1997 in Nepal for conservation and sustainable use of agrobiodiversity on-farm. Global in-situ project (1997-2006) has developed many good practices for agrobiodiversity management which are published in On-farm Management of Agricultural Biodiversity in Nepal: Good Practices 2006 (B Sthapit, P Shrestha and M Upadyay, eds). A good practice is a process or methodology or action that is effective and successful; environmentally, economically and socially sustainable; technically feasible; inherently participatory; replicable and adaptable, that has been proven to work well and produce good results. It is a successful experience tested and validated in achieving its objective. For further widening the scope of good practices in the country, NAGRC, LI-BIRD and Bioversity International have generated, tested and adapted a number of good practices in four sites, Jungu, Dolakha; Ghapanpokhara, Lamjung; Hanku, Jumla; and Chippra, Humla through a project Integrating Traditional Crop Genetic Diversity into Technology: Using a Biodiversity Portfolio Approach to Buffer against Unpredictable Environmental Change in the Nepal Himalayas , commonly called as Local Crop Project (LCP) from 2014 to 2019. Good practices listed here are well tested and adapted by the communtiies in the fields, shown their positive impact, shared and discussed among the relevant stakholders. Project team have tested and validated many good practices, however, we have included 22 good practices that are worth sharing for its dessimination and mainstreaming. These practices, though specially based on eight crops (rice, bean, barley, foxtail millet, proso millet, amaranth and buckwheat), can be widely applicable to other agricultural genetic ressources in different locations, national and globally.</div></div><div class="metadata-field field-pdf-url"><h2 class="label-above">Download</h2><ul><li><a href="https://cgspace.cgiar.org/rest/rest/bitstreams/60458a1d-83e2-4063-837f-bfc3c682564e/retrieve" target="_blank" absolute="1">Download PDF</a></li></ul></div><div class="field-citation metadata-field"><h2 class="label-above">Citation</h2><div class="field-content">Joshi, B.K.; Gauchan, D.; Bhandari, B.; Jarvis, D. (eds.) (2020) Good practices for agrobiodiversity management. Katmandu (Nepal): NAGRC, LI-BIRD and Alliance of Bioversity International and CIAT, 157 p. ISBN: 978-92-9255-149-0</div></div><div class="metadata-field field-status"><h2 class="label-above">Accessibility</h2>Open Access</div><div class="metadata-field field-permalink"><h2 class="label-above">Permalink</h2><a href="https://hdl.handle.net/10568/109625">https://hdl.handle.net/10568/109625</a></div> Sat, 10 Jul 2021 11:37:41 +0000 Anonymous 19479 at https://wle.cgiar.org https://wle.cgiar.org/good-practices-agrobiodiversity-management#comments Guideline for agronomy and soil fertility data collection in Ethiopia: National standard https://wle.cgiar.org/guideline-agronomy-and-soil-fertility-data-collection-ethiopia-national-standard <div class="metadata-field field-type"><strong class="label-above">Type</strong>Book</div><div class="metadata-field field-language"><strong class="label-above">Language</strong>en</div><div class="metadata-field field-author"><h2 class="label-above">Authors</h2><ul><li>Abera, Dejene</li><li>Liben, Feyera M.</li><li>Shimbir, Tesfaye</li><li>Balemi, Tesfaye</li><li>Erkossa, Teklu</li><li>Demiss, Mulugeta</li><li>Tamene, Lulseged D.</li></ul></div><img typeof="foaf:Image" src="https://wle.cgiar.org/sites/default/files/Agronomy_SoilFertility_Ethiopia.pdf__0.jpg" width="212" height="300" alt="" /><div class="field-abstract"><div class="field-content">Recently, recognition has been growing of the power of data and information for better decisionmaking and service provision in agriculture. To ensure good data quality, an agreed standard to collect, store, and share data along the agricultural value chain is required. With this background, the purpose of this guideline is to provide guidance on standardizing soil and agronomy data collection and thereby enhance temporal and spatial data interoperability. Standard field research design, data collection, and data reporting are required for well-informed meta-analyses and syntheses of agricultural research data as well as for making these data more accessible for calibration and evaluation of process-based models. Hence, this guideline is a contribution toward enabling meta-analysis of different data collected over years and/or space to accumulate evidence and generate new knowledge or insights to facilitate informed decision-making in the agricultural sector in general and in the crop development subsector. This guideline is compiled and intended for use by researchers, academicians, students, and other interested professionals in Ethiopia and beyond. The guideline is developed based on accepted standards and procedures in the field. Nevertheless, it is not exhaustive in its coverage of the soil and agronomic data types and crops grown in the country. Hence, additions and updates depending on the development of research facilities, the ever-changing focus of agricultural research and production systems, and advances in technology are warranted.</div></div><div class="metadata-field field-pdf-url"><h2 class="label-above">Download</h2><ul><li><a href="https://cgspace.cgiar.org/rest/rest/bitstreams/a03c40b9-fc8e-4692-a17d-21b7525e71c3/retrieve" target="_blank" absolute="1">Download PDF</a></li></ul></div><div class="field-citation metadata-field"><h2 class="label-above">Citation</h2><div class="field-content">Abera, D.; Liben, F.M.; Shimbir, T.; Balemi, T.; Erkossa, T.; Demiss, M.; Tamene, L. (2020) Guideline for agronomy and soil fertility data collection in Ethiopia: National standard. Addis Ababa (Ethiopia): Ethiopian Institute of Agricultural Research (EIAR). 31 p.</div></div><div class="metadata-field field-status"><h2 class="label-above">Accessibility</h2>Open Access</div><div class="metadata-field field-permalink"><h2 class="label-above">Permalink</h2><a href="https://hdl.handle.net/10568/110586">https://hdl.handle.net/10568/110586</a></div> Sat, 10 Jul 2021 11:37:41 +0000 Anonymous 19481 at https://wle.cgiar.org https://wle.cgiar.org/guideline-agronomy-and-soil-fertility-data-collection-ethiopia-national-standard#comments Guideline for soil biology data collection in Ethiopia: National standard https://wle.cgiar.org/guideline-soil-biology-data-collection-ethiopia-national-standard <div class="metadata-field field-type"><strong class="label-above">Type</strong>Book</div><div class="metadata-field field-language"><strong class="label-above">Language</strong>en</div><div class="metadata-field field-author"><h2 class="label-above">Authors</h2><ul><li>Mnalku, Abere</li><li>Demissie, Negash</li><li>Assefa, Fassil</li><li>Tamene, Lulseged D.</li></ul></div><img typeof="foaf:Image" src="https://wle.cgiar.org/sites/default/files/SoilBiology_DataCollection_Ethiopia.pdf__0.jpg" width="212" height="300" alt="" /><div class="field-abstract"><div class="field-content">Recently, recognition has been growing of the power of data and information for better decisionmaking and service provision in agriculture. To ensure good data quality, an agreed standard to collect, store, and share data along the agricultural value chain is required. With this background, the purpose of this guideline is to provide guidance on standardizing soil biology data collection and thereby enhance temporal and spatial data interoperability. Standard field research design, data collection, and data reporting are required for well-informed meta-analyses and syntheses of agricultural research data as well as for making these data more accessible for calibration and evaluation of process-based models. Hence, this guideline is a contribution toward enabling meta-analysis of different data collected over years and/or space to accumulate evidence and generate new knowledge or insights to facilitate informed decision-making in the agricultural sector in general and in the crop development subsector. This guideline is compiled and intended for use by researchers, academicians, students, and other interested professionals in Ethiopia and beyond. The guideline is developed based on accepted standards and procedures in the field. Nevertheless, it is not exhaustive in its coverage of the soil biology data types and crops grown in the country. Hence, additions and updates depending on the development of research facilities, the ever-changing focus of agricultural research and production systems, and advances in technology are warranted.</div></div><div class="metadata-field field-pdf-url"><h2 class="label-above">Download</h2><ul><li><a href="https://cgspace.cgiar.org/rest/rest/bitstreams/d43dc51e-1dee-4f9f-97a5-e9b06d03f8a3/retrieve" target="_blank" absolute="1">Download PDF</a></li></ul></div><div class="field-citation metadata-field"><h2 class="label-above">Citation</h2><div class="field-content">Mnalku A; Demissie N; Assefa F.; Tamene, L. (2020) Guideline for soil biology data collection in Ethiopia: National standard. Addis Ababa (Ethiopia): Ethiopian Institute of Agricultural Research (EIAR). 29 p.</div></div><div class="metadata-field field-status"><h2 class="label-above">Accessibility</h2>Open Access</div><div class="metadata-field field-permalink"><h2 class="label-above">Permalink</h2><a href="https://hdl.handle.net/10568/110585">https://hdl.handle.net/10568/110585</a></div> Sat, 10 Jul 2021 11:37:41 +0000 Anonymous 19480 at https://wle.cgiar.org https://wle.cgiar.org/guideline-soil-biology-data-collection-ethiopia-national-standard#comments Groundwater governance and irrigated agriculture https://wle.cgiar.org/groundwater-governance-and-irrigated-agriculture <div class="metadata-field field-region"><strong class="label-above">Regions</strong><ul class="comma-list"><li>Latin America</li></ul></div><div class="metadata-field field-type"><strong class="label-above">Type</strong>Book</div><div class="metadata-field field-language"><strong class="label-above">Language</strong>en</div><div class="metadata-field field-author"><h2 class="label-above">Authors</h2><ul><li>Shah, Tushaar</li></ul></div><div class="metadata-field field-pdf-url"><h2 class="label-above">Download</h2><ul><li><a href="https://www.gwp.org/Global/ToolBox/Publications/Background%20papers/GWP_TEC_19_web.pdf" target="_blank" absolute="1">Download</a></li></ul></div><div class="field-citation metadata-field"><h2 class="label-above">Citation</h2><div class="field-content">Shah, Tushaar. 2014. Groundwater governance and irrigated agriculture. Stockholm, Sweden: Global Water Partnership, Technical Committee (TEC).. 71p. (TEC Background Papers 19)</div></div><div class="metadata-field field-status"><h2 class="label-above">Accessibility</h2>Open Access</div><div class="metadata-field field-research-theme"><strong class="label-above">Research Themes</strong><ul class="comma-list"><li><a href="/research/themes/land-and-water-solutions-sustainable-agriculture" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Land and Water Solutions for Sustainable Agriculture</a></li></ul></div><div class="metadata-field field-permalink"><h2 class="label-above">Permalink</h2><a href="https://hdl.handle.net/10568/65257">https://hdl.handle.net/10568/65257</a></div> Thu, 19 Nov 2020 22:02:41 +0000 Anonymous 18058 at https://wle.cgiar.org https://wle.cgiar.org/groundwater-governance-and-irrigated-agriculture#comments Groundwater availability and use in Sub-Saharan Africa: a review of 15 countries https://wle.cgiar.org/groundwater-availability-and-use-sub-saharan-africa-review-15-countries <div class="metadata-field field-region"><strong class="label-above">Regions</strong><ul class="comma-list"><li>Southern Africa</li></ul></div><div class="metadata-field field-type"><strong class="label-above">Type</strong>Book</div><div class="metadata-field field-language"><strong class="label-above">Language</strong>en</div><div class="metadata-field field-author"><h2 class="label-above">Authors</h2><ul><li>Pavelic, Paul</li><li>Giordano, Mark</li><li>Keraita, Bernard N.</li><li>Ramesh, Vidya</li><li>Rao, Tamma</li></ul></div><div class="field-abstract"><div class="field-content">Traditionally, the spread and extent of human settlement beyond the major riparian zones of Sub-Saharan Africa (SSA) and across many other arid regions of the world, has been determined by availability of groundwater supplies, accessed through hand-dug wells andsprings. In more recent times, groundwater is the preferred means of supplying water to meet the growing demand of the rural, dispersed communities and the small urban towns across SSA. It is estimated that about 100 million of the rural population throughout SSA areserviced by groundwater for domestic supplies and livestock rearing (Adelana and MacDonald, 2008), with most of the villages and small towns having access to groundwater supplies (Masiyandima and Giordano, 2007).</div></div><div class="metadata-field field-pdf-url"><h2 class="label-above">Download</h2><ul><li><a href="https://cgspace.cgiar.org/rest/rest/bitstreams/a587423c-3623-4071-8e8e-019226372fa1/retrieve" target="_blank" absolute="1">Download PDF</a></li></ul></div><div class="field-citation metadata-field"><h2 class="label-above">Citation</h2><div class="field-content">Pavelic P, Giordano M, Keraita B, Ramesh V, Rao T, eds. 2012. Groundwater availability and use in Sub-Saharan Africa: a review of 15 countries. Colombo, Sri Lanka: International Water Management Institute (IWMI).</div></div><div class="metadata-field field-status"><h2 class="label-above">Accessibility</h2>Open Access</div><div class="metadata-field field-permalink"><h2 class="label-above">Permalink</h2><a href="https://hdl.handle.net/10568/33844">https://hdl.handle.net/10568/33844</a></div><div class="field-altmetric-embed"><div class="altmetric-embed" data-badge-popover="right" data-badge-type="medium-donut" data-doi="https://doi.org/10.5337/2012.213"></div></div> Thu, 19 Nov 2020 22:02:41 +0000 Anonymous 16526 at https://wle.cgiar.org https://wle.cgiar.org/groundwater-availability-and-use-sub-saharan-africa-review-15-countries#comments The Evolving Farming and Pastoral Landscapes in Ethiopia: A Farming System Framework for Investment Planning and Priority Setting https://wle.cgiar.org/evolving-farming-and-pastoral-landscapes-ethiopia-farming-system-framework-investment-planning-and <div class="metadata-field field-type"><strong class="label-above">Type</strong>Book</div><div class="metadata-field field-subject"><strong class="label-above">Subjects</strong><ul class="comma-list"><li>Investment</li><li>Land Management</li></ul></div><div class="metadata-field field-language"><strong class="label-above">Language</strong>en</div><div class="metadata-field field-author"><h2 class="label-above">Authors</h2><ul><li>Amede, Tilahun</li><li>Auricht, C.</li><li>Boffa, Jean-Marc</li><li>Dixon, John A.</li><li>Mallawaarachchi, T.</li><li>Rukuni, M.</li><li>Teklewold-Deneke, T.</li></ul></div><div class="metadata-field field-pdf-url"><h2 class="label-above">Download</h2><ul><li><a href="https://www.researchgate.net/publication/296525932_The_Evolving_Farming_and_Pastoral_Landscapes_in_Ethiopia_A_Farming_System_Framework_for_Investment_Planning_and_Priority_Setting" target="_blank" absolute="1">Download</a></li></ul></div><div class="field-citation metadata-field"><h2 class="label-above">Citation</h2><div class="field-content">Amede, T.; Auricht, C.; Boffa, J.M.; Dixon, J.; Mallawaarachchi, T., Rukuni, M.; Teklewold-Deneke, T. 2015. The Evolving Farming and Pastoral Landscapes in Ethiopia: A Farming System Framework for Investment Planning and Priority Setting, ACIAR, Canberra, July, 2015. ACIAR Publication Series.</div></div><div class="metadata-field field-status"><h2 class="label-above">Accessibility</h2>Open Access</div><div class="metadata-field field-permalink"><h2 class="label-above">Permalink</h2><a href="https://hdl.handle.net/10568/75700">https://hdl.handle.net/10568/75700</a></div><div class="metadata-field field-solution"><strong class="label-above">Solutions</strong><ul class="comma-list"><li><a href="/solutions/landscape-restoration" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Landscape Restoration</a></li></ul></div> Thu, 19 Nov 2020 22:02:41 +0000 Anonymous 16516 at https://wle.cgiar.org https://wle.cgiar.org/evolving-farming-and-pastoral-landscapes-ethiopia-farming-system-framework-investment-planning-and#comments Farming systems and food security in Africa: priorities for science and policy under global change https://wle.cgiar.org/farming-systems-and-food-security-africa-priorities-science-and-policy-under-global-change <div class="metadata-field field-region"><strong class="label-above">Regions</strong><ul class="comma-list"><li>Middle Africa</li><li>Southern Africa</li></ul></div><div class="metadata-field field-type"><strong class="label-above">Type</strong>Book</div><div class="metadata-field field-language"><strong class="label-above">Language</strong>en</div><div class="metadata-field field-author"><h2 class="label-above">Authors</h2><ul><li>Dixon, J.</li><li>Garrity, D. P.</li><li>Boffa, Jean-Marc</li><li>Williams, Timothy O.</li><li>Amede, Tilahun</li><li>Auricht, C.</li><li>Lott, R.</li><li>Mburathi, G.</li></ul></div><div class="metadata-field field-pdf-url"><h2 class="label-above">Download</h2><ul><li><a href="https://apps.worldagroforestry.org/downloads/Publications/PDFS/B20003.pdf" target="_blank" absolute="1">Download</a></li></ul></div><div class="field-citation metadata-field"><h2 class="label-above">Citation</h2><div class="field-content">Dixon, J.; Garrity, D. P.; Boffa, J.-M.; Williams, Timothy Olalekan; Amede, T.; Auricht, C.; Lott, R.; Mburathi, G. (Eds.). 2020. Farming systems and food security in Africa: priorities for science and policy under global change. Oxon, UK: Routledge - Earthscan. 638p. (Earthscan Food and Agriculture Series)</div></div><div class="metadata-field field-status"><h2 class="label-above">Accessibility</h2>Open Access</div><div class="metadata-field field-research-theme"><strong class="label-above">Research Themes</strong><ul class="comma-list"><li><a href="/research/themes/variability-risks-and-competing-uses" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Variability, Risks and Competing Uses</a></li></ul></div><div class="metadata-field field-permalink"><h2 class="label-above">Permalink</h2><a href="https://hdl.handle.net/10568/109061">https://hdl.handle.net/10568/109061</a></div><div class="field-altmetric-embed"><div class="altmetric-embed" data-badge-popover="right" data-badge-type="medium-donut" data-doi="https://doi.org/10.4324/9781315658841"></div></div> Thu, 19 Nov 2020 22:02:41 +0000 Anonymous 18606 at https://wle.cgiar.org https://wle.cgiar.org/farming-systems-and-food-security-africa-priorities-science-and-policy-under-global-change#comments Global food security: emerging issues and economic implications https://wle.cgiar.org/global-food-security-emerging-issues-and-economic-implications <div class="metadata-field field-type"><strong class="label-above">Type</strong>Book</div><div class="metadata-field field-language"><strong class="label-above">Language</strong>en</div><div class="metadata-field field-author"><h2 class="label-above">Authors</h2><ul><li>Hanjra, Munir A.</li></ul></div><div class="field-citation metadata-field"><h2 class="label-above">Citation</h2><div class="field-content">Hanjra, Munir A. (Ed.) 2013. Global food security: emerging issues and economic implications. New York, NY, USA: Nova Science Publishers. 297p.</div></div><div class="metadata-field field-status"><h2 class="label-above">Accessibility</h2>Limited Access</div><div class="metadata-field field-permalink"><h2 class="label-above">Permalink</h2><a href="https://hdl.handle.net/10568/36193">https://hdl.handle.net/10568/36193</a></div> Thu, 19 Nov 2020 22:02:41 +0000 Anonymous 16429 at https://wle.cgiar.org https://wle.cgiar.org/global-food-security-emerging-issues-and-economic-implications#comments On-farm treatment options for wastewater, greywater and fecal sludge with special reference to West Africa https://wle.cgiar.org/farm-treatment-options-wastewater-greywater-and-fecal-sludge-special-reference-west-africa <div class="metadata-field field-type"><strong class="label-above">Type</strong>Book</div><div class="metadata-field field-subject"><strong class="label-above">Subjects</strong><ul class="comma-list"><li>Resource recovery/reuse</li><li>Wastewater</li></ul></div><div class="metadata-field field-language"><strong class="label-above">Language</strong>en</div><div class="metadata-field field-author"><h2 class="label-above">Authors</h2><ul><li>Keraita, Bernard N.</li><li>Drechsel, Pay</li><li>Klutse, Amah</li><li>Cofie, Olufunke O.</li></ul></div><div class="metadata-field field-pdf-url"><h2 class="label-above">Download</h2><ul><li><a href="https://cgspace.cgiar.org/rest/rest/bitstreams/0425bd1c-e45c-4d0e-9113-0e28040808f5/retrieve" target="_blank" absolute="1">Download PDF</a></li></ul></div><div class="field-citation metadata-field"><h2 class="label-above">Citation</h2><div class="field-content">Keraita, B.; Drechsel, P.; Klutse, A.; Cofie, O. 2014. Onfarm treatment options for wastewater, greywater and fecal sludge with special reference to West Africa. Colombo, Sri Lanka: International Water Management Institute (IWMI). CGIAR Research Program on Water, Land and Ecosystems (WLE). 32p. (Resource Recovery and Reuse Series 1).</div></div><div class="metadata-field field-status"><h2 class="label-above">Accessibility</h2>Open Access</div><div class="metadata-field field-research-theme"><strong class="label-above">Research Themes</strong><ul class="comma-list"><li><a href="/research/themes/rural-urban-linkages" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Rural-Urban Linkages</a></li></ul></div><div class="metadata-field field-permalink"><h2 class="label-above">Permalink</h2><a href="https://hdl.handle.net/10568/35209">https://hdl.handle.net/10568/35209</a></div><div class="metadata-field field-solution"><strong class="label-above">Solutions</strong><ul class="comma-list"><li><a href="/solutions/urbanization" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Urbanization</a></li></ul></div><div class="field-altmetric-embed"><div class="altmetric-embed" data-badge-popover="right" data-badge-type="medium-donut" data-doi="https://doi.org/10.5337/2014.203"></div></div> Thu, 19 Nov 2020 22:02:41 +0000 Anonymous 18353 at https://wle.cgiar.org https://wle.cgiar.org/farm-treatment-options-wastewater-greywater-and-fecal-sludge-special-reference-west-africa#comments