Global boiling, and crashed crafts on Mars

Sweltering temperatures wreak havoc across Europe and North America, so what needs to be done to bring them down? We hear from the Cambridge scientist who wants to create the largest ever DNA and health research programme for children and young people. And, did aliens crash-land on Mars? Strange pictures resembling a crash site have been circulating but is there a more mundane explanation? Like this podcast? Please help us by supporting the Naked Scientists