A new study shows air pollution from Canada's oil sands could be 4 times higher than previously reported.
As rich countries have foundered, India and China have emerged as global leaders in tackling warming.
References to greenhouse gases and reducing petroleum have been deleted in favor of the economy.
Removing carbon dioxide from the air may be the most effective way to meet the globe's ambitious climate goals.
Climate change has the planet on a hot streak it's unlikely to break anytime soon.
Harvard scientists plan to undertake one of the first outdoor geoengineering experiments next year.
Communities across the West will have to adapt to living with the ever-increasing threat of wildfires.
The march is not about politics. It is about not throwing away our great engine of truth.