Farmers and climate change

Because we in NH are just coming back to agriculture, perhaps there is less resistance to overcome when talking about climate change to farmers.  But in the west where farming has been the main "industry" for over a century, changing thinking is not so easy.  Certainly the awful drought there now is a hard way to learn.  So how can we talk to farmers, who work so hard and are so subject to the vagaries of weather and the climate, about this issue?  Here are some ideas.