4 Numbers About Renewable Energy

This month, the Intergovernmental Panel on Climate Change will begin releasing its fifth assessment report. Like earlier reports, it will undoubtedly lead to more calls to reduce emissions of carbon dioxide worldwide.As the discussion unfolds, I would urge everyone to keep four numbers in mind: 32, 1, 30 and 1/2. These are the numbers that explain why any transition away from our existing energy systems will be protracted and costly.