UW's Qing-Bin Lu isn't afraid to challenge accepted thinking on two of the biggest environmental issues facing our planet: ozone loss and global warming. In recent years, the physics and astronomy professor has developed some intriguing theories on the cause of these crises. When it comes to ozone loss, Lu doesn't dispute the role of chlorofluorocarbons (CFCs). As these manmade substances break down in the Earth's stratosphere, they release ozone-depleting chlorine. The question is what…