The climate has previously (and recently) been altered by human activity, but fortunately we noticed, and thankfully, as of last reports we actually may have fi

The climate has previously (and recently) been altered by human activity, but fortunately we noticed, and thankfully, as of last reports we actually may have fixed this one. "Aside from the direct effect of ultraviolet radiation on organisms, increased surface UV leads to increased tropospheric ozone, as noted above. Paradoxically, at ground-level increased ozone is generally recognized to be a health risk, as ozone is toxic due to its strong oxidant properties." http://en.wikipedia.org/wiki/Ozone_hole http://en.wikipedia.org/wiki/Ozone_hole