June 28 8:30pm BBC1 We’re told another barbecue summer and droughts are on the way - but do you really trust the predictions any more? Despite governments, scientists and campaigners telling us the world's climate is changing, increasing numbers of us simply don't believe in global warming. After one of the coldest winters on record and a vicious row about the science behind climate change, Panorama goes back to basics and asks what we really know about our climate and how it will affect us.