Global warming is the defining challenge of our time. The latest climate science tells us that the United States must reduce its emissions of global warming pollutants quickly and dramatically if we hope to avoid the most catastrophic impacts of global warming. The rest of the world must take strong action as well.
America is the largest consumer of energy in the world. Almost half of the energy we use—10 percent of the energy in the world—powers our buildings. Most of this energy comes from burning fossil fuels. Our reliance on these fuels makes us vulnerable to supply disruptions, contributes to global warming and other environmental problems, and is becoming increasingly expensive.
States are leading the way toward a new energy future that is healthier for the environment and America’s economy. Over the past decade, states have enacted a variety of policies to encourage more efficient use of energy, increase the use of clean renewable energy, and reduce the environmental impact of energy use.