Grizzly bears killed two people last year in Yellowstone National Park. After 24 years of no deadly encounters, many people were left wondering what caused the fatal attacks. Some said global warming had depleted the bears’ normal food sources. Others say the answer is much simpler.
The 42,000 plane trees lining France’s historic Canal du Midi are being felled because of a fungus brought to Europe by US soldiers in World War II. Will the planes that decorate the streets of cities such as Paris and London share the same fate?