Christopher JoyceChristopher Joyce is a correspondent on the science desk at NPR. His stories can be heard on all of NPR's news programs, including NPR's Morning Edition, All Things Considered, and Weekend Edition.
A U.S. Coast Guard crew retrieves a canister dropped by parachute in the Arctic in 2011. Over the past four decades, researchers at the University of California, Santa Barbara, and several other universities have studied shifts in atmospheric circulation above the Arctic.
More than 10 wildfires burned over 200,000 acres in Southern California in October 2003, many of them started by humans. This satellite image shows strong winds carrying smoke over the Pacific.
MODIS Rapid Response Team/NASA
Tiny, shrimplike amphipods living in the Mariana Trench were contaminated at levels similar to those found in crabs living in waters fed by one of China's most polluted rivers.
Dr. Alan Jamieson/Newcastle University
A natural gas drilling rig's lights shimmer in the evening light near Silt, Colo. Methane is the main component of natural gas, and studies show some methane escapes from leaky oil and gas operations.
Elephant tusks totaling about 15 tons are set on fire during an anti-poaching ceremony at Nairobi National Park in Nairobi, Kenya, in March 2015. Conservationists say a pledge by China to stop the ivory trade is a possible game-changer in the struggle to curb the slaughter of elephants.