John Holdren, Science Advisor to President Barack Obama: Climate change is a straightforward issue. “We are seeing increases in the frequency and intensity of a wide variety of weather extremes, again, through mechanisms and in patterns that fit the fingerprint of the human influence on climate.” This belief has led Dr. Holdren, over the course of his career, to work to drive the nation’s shift toward clean energy policies and sustainable development, and boost cooperation with nations such as India and China on energy issues. That mainly meant using less energy, using a lot less fossil fuels, advocacy for wind and solar and hardly anything for nuclear. He sometimes rides a bicycle to work.
