Reuters: Clouds at the edge of space are showing the effects of climate change, scientists said on Monday. These so-called polar mesospheric clouds are occurring more often and appearing at lower latitudes than they used to, researchers reported at a meeting of the American Geophysical Union in San Francisco. "It won’t affect people, but we’re causing the outer part of the atmosphere to change, which means we are changing the entire atmosphere, which is important to know," …