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Butterflies in a filthy city

Air pollution is a health risk, and, naturally, urban areas are more exposed to air pollution and its attendant risks than rural areas. Air pollution does not only affect the human population, but also the quantity and quality of urban biodiversity. And this includes one of the smallest of creatures — the butterfly.

The ancient giants of Yosemite, under a billion stars

YOSEMITE VALLEY, United States — The Mariposa Grove of Giant Sequoias, at the heart of California’s Yosemite National Park, is home to 500 of the towering trees — many at least 2,000 years old, having sprouted around the time of Jesus Christ.