For illustration purposes only.
Kathlean Wolf stands among native plants on the edge of a stormwater pond in her Madison, Wis., neighborhood.
California Attorney General Xavier Becerra.
Aerial view of deforestation in Nascentes da Serra do Cachimbo Biological Reserve in Altamira, Para state, Brazil, in the Amazon basin, on August 28, 2019.
The rings of Saturn take center stage in this portrait by the Hubble Space Telescope taken on June 20, 2019.
Betsy Southerlan, former water quality official at the EPA.
Human rhinovirus 16 particle illustration.
Vaping devices have been implicated in a strange lung illness that has killed six and sickened hundreds, but the cause of the damage remains elusive.
Floodwater from the North Mississippi River at Bonnet Carré Spillway, Norco, Louisiana, USA.
Lab technician putting blood sample on a slide for HIV testing, Johannesburg, Gauteng Province, South Africa.
The Polarstern research icebreaker casts its shadow across icy waters.
Arctic National Wildlife Refuge.