Associated Press: Britain’s soggy summers will become warmer and drier, and London could experience scorching heat waves by late this century, a government-backed report on climate change said Thursday. The study outlines three scenarios for climate change, based on high, medium and low global levels of greenhouse gas emissions. The report said the medium emissions scenario, to which the world is currently closest, would see summer temperatures in Britain rise by about 4 C (7.2 F) by …