Recently publicized sightings of UFOs by multiple U.S. military personnel has renewed discussion on this shadowy and often silly subject.
All tagged climate change
One year of hurricanes in the U.S. costs more than the economies of New Zealand or Finland.
Climate change is a collective action problem in which every human being will feel the impacts.
Things are heating up in the Arctic, environmentally and geopolitically.
Why Republicans should consider the latest carbon tax proposal.
Facing climate change, Cuba is poised to become a regional leader in renewable energy.
Facts are becoming an endangered species.