In this topical picture book, Michael Foreman – twice winner of the Kate Greenaway Medal and described as "the greatest illustrator-storyteller of his time" by Michael Morpurgo – brilliantly shows what climate change is doing to our world and inspires us all to make a difference. Mr World doesn’t feel well. He’s hot and sweaty and finding it hard to breathe. What will the doctors find when they examine their poor patient?