It’s close to an article of faith among environmentalists that using less energy is a big part of the solution to climate change. Energy efficiency is often said to be the “low hanging fruit” of climate policy.
On face value, the benefits seem obvious.
The knowledge needed to make big gains in efficiency already exists. Using less energy will save consumers and industry money, whereas other policies will be costly. And most importantly, lower energy use could make a big dent in global greenhouse gas emissions.