This action must begin now - with the increasing intensity of climate change impacts, building resilience will become ever more difficult. Delaying the transformation of the agricultural sectors will force poorer countries to fight poverty, hunger and climate change at the same time. Wide adoption of practices such as the use of nitrogen-efficient and heat-tolerant crop varieties, zero-tillage and integrated soil fertility management would boost productivity and farmers' incomes, and help lower food prices. By one estimate, the number of people at risk of undernourishment in developing countries in 2050 could be reduced by more than 120 million through widespread use of nitrogen-efficient crop varieties alone.