This warming is predicted to increase some crop yields in northern countries, but also bring more floods and droughts - particularly in poor nations. (news.bbc.co.uk)
In this way, communities spend less money on health care, and are able to generate income from increased crop yields. (treehugger.com)
The image below shows ancient corn versus modern corn for an example of how successful we have been at increasing crop yields through history. (valuewalk.com)