This week we talk to two researchers about the technological solutions some scientists say we might have to use to tackle climate change.With average temperatures expected to rise by 2C this century, and efforts to cut greenhouse emissions proving painfully slow so far, scientists are saying it might be prudent to have a plan B.Professor Tim Lenton and Dr Nem Vaughan from the University of East Anglia explain the differences between the two approaches to geoengineering - removing carbon dioxide from the atmosphere and reflecting sunlight to keep temperatures down.Later on we find out how scientists use a field full of radars in Wales to help forecast extreme weather.We also hear what the UK Government's chief scientific advisor thinks about the latest climate change controversies in the news, how researchers have figured out what colour dinosaurs were and why carpet sea squirts have been spotted in Scotland.