Smog, Ozone & Biodiversity

The view from Beetle Rock in Sequoia National Park, California. Smog, containing high levels of ozone, blows in from the San Joaquin Valley. TRACIE CONE / AP PHOTO

Thanks to Jim Robbins for updating our understanding of ozone’s ongoing threat (we had thought it was lessening):

Ozone Pollution: An Insidious and Growing Threat to Biodiversity

Ground-level ozone has long been known to pose a threat to human health. Now, scientists are increasingly understanding how this pollutant damages plants and trees, setting off a cascade of impacts that harms everything from soil microbes, to insects, to wildlife.

Giant sequoias in Sequoia National Park, California. MARJI LANG/LIGHTROCKET VIA GETTY IMAGES

Sequoia National Park’s famous groves of stout, 300-foot-tall trees sit high on the western side of the Sierra Nevada, above California’s San Joaquin Valley. They are threatened as never before: Wildfires have burned much of the forest, and now, for the first time, insects are killing sequoias. Continue reading