US Braces for More Wildfire Smoke and Haze from Canada.

Smoke from historic and unprecedented wildfires in Canada has blanketed the eastern US, causing unhealthy air quality and snarling air traffic. Climate change is making forests in Canada more fire-prone due to hotter, drier weather conditions and more lightning strikes. Experts warn that this year's smoke is just the beginning and that the world will burn up a lot of its forests over the next half-century, leading to more unhealthy air pollution and thousands to millions of deaths. The only real solution is to lower the amount of carbon dioxide in the atmosphere.