This synopsis is a introduction to how biochar may be used in Bangladesh to improve sustainable food production, but it is also on how biochar technology will have to be adapted to meet local conditions. The main difficulties are a shortage of biomass and a large population that has limited disposable income. One approach is to make biochar as a by-product of cooking with gasifier stoves, then use the biochar with composts and manures in homestead gardening. The ultimate goal is to increase food security for a people facing strong consequences of climate change. Meeting this goal is an exciting, interdisciplinary challenge.