"It's all related to global warming. That's what's happening. We've seen in the past century, sea level is rising four times faster than in the preceding 1,000 years," Torngvist says.

Every year, world leaders meet at climate conferences and hash out agreements that mean nothing. A new paper suggests a very different strategy for the world to meet its global-warming goals.

You may not believe me, but I have news about global warming: Good news, and better news. Here is the good news. US carbon emissions are decreasing rapidly. We're down over 10% from our emissions ...

Not all contrails contribute to global warming. According to Google researchers, only about 15% of flights need to avoid making contrails to help with this effort.