The Trump administration will recommend to Congress ways it can shrink or abolish national monuments.
Cullen speaks to crowd marching for sound science in Washington D.C.
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.
Here's why the March for Science was the perfect vehicle to talk about climate change.
Over Trump's first 100 days, we're going to show what science tells us about our warming world.
References to greenhouse gases and reducing petroleum have been deleted in favor of the economy.
One of the March for Science's most remote marches will focus heavily on climate change.
Removing carbon dioxide from the air may be the most effective way to meet the globe's ambitious climate goals.
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.
Climate financing was a major bone of contention during negotiations in Paris in 2015.
President Trump has yet to appoint the head of the U.S. weather and climate agency.
Major oil companies, feeling pressure from low oil prices and global climate policy, are fleeing Canada's oil sands.
U.S. energy-related carbon pollution fell in 2016, part of a decade-long trend as utilities use less coal.
On the eve of the March for Science, organizers have started hinting about what they plan to do next.
The Trump administration seems to be quietly embracing offshore wind power and its economic potential.
Some big American coal companies want President Trump to keep the U.S. in the Paris climate pact.
A California appeals court rejected a claim that payments required to release greenhouse gases are a tax.
The expunging of climate information from government websites continues to march forward.