When National Geographic first sent some of the world's best photographers and mapmakers on assignment more than 125 years ago, we didn't set to capture the "before" photos for an imperiled planet. But that's exactly what happened.
Over the decades, from the Matterhorn to the Great Barrier Reef to the West Antarctic Ice Sheet, these intrepid explorers became the visual record-keepers of climate change.
Today, that record is alarmingly clear. Since the late 19th century, Earth's average temperature has increased 1.5 degrees Fahrenheit, melting glaciers and raising sea levels.
As President Barack Obama noted this year, "shrinking ice caps forced National Geographic to make the biggest change in its atlas since the Soviet Union broke apart."… Seguir leyendo »