Science News: It’s hard to imagine a mountain range without snow-covered peaks. But that may soon be the case in countries in or near the tropics. Studies show that the ice that sits atop the world’s highest mountains is vanishing at an alarming rate, threatening to leave the summits bare. The accelerated melting of these glacial caps is visible evidence that Earth is getting warmer, scientists say. Most of Earth’s glaciers have been shrinking for decades as our climate has been warming from …