popsci.com

http://popsci.com

What caused the smoke trail off the coast of California on November 8, 2010?

A missile

Mystery Missile Launches Off Southern California Coast, Military Says 'Not Us' | Popular Science

Mystery Missile Launches Off Southern California Coast, Military Says 'Not Us'

Last night the normally hazy sunset off the southern California coast was interrupted by a missile streaking upward and across the sky, captured by a local CBS News affiliate's helicopter camera.

Go to Dispute Report

Is global warming caused by humans?

Yes, humans are primarily responsible for global warming.

Climate Change Skeptics | Popular Science

To wit, the U.S. National Academy of Sciences declared in 2005 that "greenhouse gases are accumulating in Earth's atmosphere as a result of human activities, causing surface air temperatures and subsurface ocean temperatures to rise," adding that "the scientific understanding of climate change is now sufficiently clear to justify nations taking prompt action."

Go to Dispute Report