Mt. Pinatubo erupted just before the first sea level temperature-gauging satellite was launched in 1991. Why that matters.
Earth Overshoot Day – marking the point in the year when we've used up more natural resources than we can regenerate – falls on Aug. 8 this year, the earliest date yet.
The Schoenbrunn Zoo in Vienna's Giant panda Yang Yang has given birth to her fourth cub. It's about 800 times smaller than mom.
A US government report warns that the US will likely fall short of its 2025 fuel-economy targets because low gas prices have prompted Americans to buy less-efficient cars and trucks.