There is good news and bad news about the clean energy transition. The good news is that half the new electric generating capacity installed worldwide in 2008-2010 was renewable. The bad news is that half wasn’t.
To avoid rapid global warming and its attendant human and economic risks, we need to accelerate the transition. We need to do more than slower growth in the use of fossil fuels: we need to cut their use substantially. This will require significantly ramped up investments worldwide in energy efficiency and clean energy.