As climate change bites in America’s midwest, farmers are desperate to ring the alarm

'The changes have become more radical': farmers are spending more time and money trying to grow crops in new climates

Richard Oswald did not need the latest US government report on the creeping toll of climate change to tell him that farming in the midwest is facing a grim future, and very likely changing forever.

For Oswald, the moment of realisation came in 2011.