Policymakers must focus on the handful of policies that are most effective at reducing emissions, and a small set of design principles can make all the difference.

The free, open-source EPS computer model can help you design packages of policies to reduce pollution. You can visualize policies' effects on emissions, cash flows, power plants, electric vehicles, and more. To start, select a region.

With climate change already impacting communities worldwide, the need to cut greenhouse gas emissions has never been more urgent. It’s a daunting challenge, but the technologies and strategies to meet it exist today. Government officials and other policymakers need a clear resource outlining which energy policies can put us on the path to a low-carbon future, and how to best design those policies.