(Update: As expected, today, EPA chief Lisa Jackson announced that greenhouse gases, including from vehicles, are a danger to public health that should be regulated. Earthjustice President Trip Van Noppen immediately welcomed the announcement, commenting in part that "our nation must move quickly and efficiently to achieve the cuts in carbon dioxide and other global warming pollution needed to stave off catastrophic climate change." Read his full statement here.)

As the climate change conference convenes in Copenhagen, Lisa Jackson, head of the Environmental Protection Agency, is set to declare today that carbon dioxide and other greenhouse gas emissions are a danger to public health.

In April, the EPA released an endangerment finding, acknowledging that greenhouse gases endanger public health and welfare. Jackson's latest announcement finalizes that initial action toward addressing global warming pollution under the Clean Air Act. At the time, we said:

The Obama administration has removed a road block in curbing pollution responsible for climate change and signaled a turn toward a clean energy future. We applaud this action, and welcome the President's leadership to overcome the greatest environmental challenge of our time.