Between 1880 and 2012, global temperatures rose. And every time the temperature rises, grain production falls. From 1981 to 2002, global corn, wheat and other crops were reduced by 40 million tons per year due to global warming. 
Other food crops, except corn and wheat, have not increased production as a result of global warming
 in order to curb global warming and ensure global food security, we must start from our own, energy conservation and emission reduction, control the total amount of carbon emissions.