Climate Change and Agriculture

Stuart Staniford reports from a climate change conference in New York:

• This morning I was in Cortland all morning for the section on adapting agriculture to climate change.  The audience was smaller (it being a weekday), but the speakers were excellent - in the main session we heard from scientists and then at lunch we heard from actual growers.  The basic message was the same from everyone:
• New York State has warmed noticeably, particularly in the winter.  The growing season is longer.  One big dairy operator mentioned that in 1973 he was planting 80 day corn on his hills and 90 day on his river bottom land, whereas today he is planting 95 day corn on the hills and 110 day corn on the bottomland.
• The weather is also noticeably more extreme.  There are more droughts, more floods, more risk of frosts during the longer growing season, more occasions when they can't get machinery into the fields because the weather is too wet, and more big snowfalls.  This showed up both in the scientist's statistics and also the grower's anecdotes.  The scientists all pinned this on more moisture in the warmer atmosphere and changes in the circulation due to a warmer Arctic.
• Here are corn yields in New York State since 1945.  There is the same linear pattern that yields often show nationally and globally.  Although the climate is certainly affecting agriculture here in both positive and negative ways, apparently it all nets out to maintain roughly the existing trend:

 

The increase in relative maturity for that dairyman is amazing.