Agriculture both affects and is affected by climate change. No other sector is more climate-sensitive. Agricultural and food production in developing countries will be adversely affected by climate change, especially in countries that are already climate-vulnerable (drought, flood and cyclone prone), and that have low incomes and high incidence of hunger and poverty. Adaptation of the agriculture sector to climate change will be costly but necessary for food security, poverty reduction and maintenance of ecosystem services. Reduction and removal of greenhouse gases (mitigation) from agriculture will also be necessary, if global mitigation efforts are to be successful.