`` Another $ 20 billion per year is enough to spur an energy revolution and a massive uptake of green energy . How much would $ 700 billion help climate change mitigation and adaptation ? Greenpeace USA says $ 700 billion would ` ` give us a good head start '' U.S. government economic gains would be ` ` extraordinary '' compared to doing nothing .
How much would $ 700 billion help climate change mitigation and adaptation ? Greenpeace USA says $ 700 billion would ` ` give us a good head start '' U.S. government economic gains would be ` ` extraordinary '' compared to doing nothing .