ScienceDaily: Ever-rising greenhouse gas emissions and the potential need to deploy untested and expensive climate engineering technologies are just two of the many bits of bad news in the Intergovernmental Panel on Climate Change's new report on "Mitigation of Climate Change," released on 13 April. But there's good news hidden in the bad. If we take action to cool the planet, we can also expect the added benefit of cleaner air, particularly in China, says Professor Edgar Hertwich, from the Norwegian University...