Global warming is real, here, and happening faster than anyone predicted.

But scientists also say we can curb global warming and its consequences—if we take bold, comprehensive actions now that add up to an 80 percent cut in carbon emissions by 2050. That's a do-able 2 percent cut a year for each of the next 40 years.

To reach our goal, to build a cleaner, smarter, and safer energy and economic future and rise to the most urgent challenge of our generation, we must all be part of the solution. You, me, businesses, and government—we all have a role to play.

To cut carbon emissions 2 percent a year for each of the next 40 years means we must start right now to make different, better decisions about the energy we use at home, at work, and as a nation.