Ignoring the human effects of extreme weather (long report
here) the economic effects of climate change could be huge.
SwissRe who know a thing or bit about risk as a reinsurer (one of the those huge companies you've never heard of) has
this page where the risks of climate change are assessed for the 48 countries who account for 90% of the global GDP. The resilience of each country to the effects of heat, sea level rise, health, crop yield and tourism can be seen on the country drop down. However, the overall assessment is India, SE Asia and northern S.America could be in for a world of pain.