. >> reporter: nat keohane is senior vice president for climate at the environmental defense fund, and also is an obama administration alum. >> that target has to put us on a path to 100% clean economy, net-zero emissions by 2050 at the latest. that's the overall target. and that means by 2030, we need to be 45% to 50% below 2005 levels of pollution across the economy. so that's a big lift. to be credible, the biden administration needs to show it is working on all fronts, including with congress, to get the policy changes that we need. >> reporter: both keohane and bordoff say, given the political headwinds, the incoming biden administration will need to think strategically about how to incorporate climate into all aspects of the executive branch. both were on the steering committee of the climate 21 project, a blueprint released this week laying out actionable advice for a government-wide climate response coordinated by the white house. >> the climate 21 plan was really thinking deeply about how to move quickly and elevate climate change within the priority and staffing structure of