Petrochemical facilities in the Houston area are assessing their hurricane preparedness after Hurricane Harvey. This oil refinery reinforced storage tank roofs with geodesic domes — the gray caps on some of the white tanks in the photo — to better withstand a deluge. Win McNamee/Getty Images hide caption
The harvest is bad for German farmers this year as the country has experienced the hottest summer on record and months without rainfall. Christian Ender/Getty Images hide caption
A thick layer of smoke from the Carr Fire settles over California's Central Valley in a view from a jet earlier this summer. Fine particulate matter from drifting wildfire smoke mixes with industrial ozone and can become trapped between the mountain ranges. George Rose/Getty Images hide caption
Drew Calver, a high school history teacher and swim coach in Austin, Texas, had a heart attack at his home on April 2, 2017. A neighbor rushed him to the nearby emergency room at St. David's Medical Center, which wasn't in the school district's health plan. Callie Richmond/KHN hide caption
A demonstrator holds a flag with an image of Earth during a protest against the Kinder Morgan Canada Ltd. Trans Mountain pipeline expansion on June 2. On Thursday a Federal Court of Appeal ruled to stop the expansion projects indefinitely. Bloomberg/Bloomberg via Getty Images hide caption
The city of Austin is installing cameras that will let residents see rising floodwaters at key intersections. Eddie Gaspar/KUT hide caption
As the climate warms, drought is killing large numbers of trees in California. Scientists are looking to the past to try to understand how the ecosystems of today may be changing. Ashley Cooper/Getty Images hide caption
Some research suggests that having multiples increases a parent's risk of mental health concerns â like depression and anxiety â before and after the children are born. Don't be afraid to admit it, parents advise. Emotional support can help. Terry Vine/Getty Images hide caption
Workers in dust masks wash fresh red bell peppers in smoky conditions outside of Eltopia, Wash. Even with the masks, the smoke is still causing tight chests, itchy eyes and dry throats. Anna King/Northwest News Network hide caption
These PET scans show the normal distribution of opioid receptors in the human brain. A new study suggests ketamine may activate these receptors, raising concern it could be addictive. Philippe Psaila/Science Source hide caption