Put this four-point plan into action and carbon dioxide emissions will drop to half of current levels by 2050.

We have solutions in hand right now to drastically cut global warming pollution. Act now -- put clean, innovative energy technologies to use, and enact policies to encourage their rapid, widespread adoption -- and we can stop global warming in its tracks. Instead of nearly doubling U.S. global warming pollution by 2050, we can cut it in half.

This four-point plan is how we do it.