Agriculture, deforestation and other changes to the land account for nearly one third of global emissions. To successfully tackle global change, it’s imperative to curb the emissions generated by burning fossil fuels. According to the fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC), warming in Sub Saharan Africa (SSA), where most livelihoods are dependent on agriculture, is expected to be greater than the global average and rainfall will decrease in certain regions. This is currently being experienced in most of SSA, including the Horn of Africa and thus calls for a more ecosystem based approach farming practices of which Evergreen Agriculture is one thereof.
EverGreen Agriculture systems can be part of the solution to tackling climate change — and are increasing in popularity in many countries. Increasing the number of trees in farmland helps to reduce the emissions of carbon to the atmosphere that eventually cause climate change. Fertilizer trees provide three different carbon sinks: above ground woody biomass (time averaged for systems that are regularly pruned or in rotation), below ground root systems (the most permanent of the sinks), and contribution to soil carbon. A study done in Malawi and Zambia saw that, trees in conservation agriculture (CAWT) accumulate carbon both above and below ground in the range of 2-4 tonnes of carbon per hectare per year. Other findings however, have reported soil C of 33.2 Mg-87.3Mg C ha-1per year in a total carbon stock (above-ground + root biomass + soil C to 0-100 cm depth)
In Niger, Farmer Managed Natural Regeneration has regenerated 200,000 trees on 5 million hectares of land, and 100 million tonnes of carbon have been sequestered. It is therefore a further indication that adopting EverGreen Agriculture is not only key to enhancing food production and other benefits but also mitigating climate change.
http://www.terrafrica.org/sites/default/files/TerrAfrica-EcoAg Climate brief 2_mitigation.pdf