The metal roofs of Kibera, a one-square-mlle slum community in Nairobi. Herbert Misiani hide caption
climate
President Donald Trump shakes hands with EPA chief Scott Pruitt on June 1 after speaking about the U.S. role in the Paris climate change accord in the Rose Garden of the White House in Washington. Andrew Harnik/AP hide caption
The Agriculture Department established research centers in 2014 to translate climate science into real-world ideas to help farmers and ranchers adapt to a hotter climate. But a tone of skepticism about climate change from the Trump administration has some farmers worried that this research they rely on may now be in jeopardy. Luke Runyon/Harvest Public Media hide caption
A refinery in Anacortes, Wash. In 2016, voters in Washington state rejected an initiative that would have taxed carbon emissions from fossil fuels such as coal and gasoline. Ted S. Warren/AP hide caption
Participants at the Marrakech climate conference stage a public show of support for climate negotiations and the Paris agreement on Friday. David Keyton/AP hide caption
Agustin Mayta Condori shows a sick alpaca, which he predicted would die the next day because of subfreezing temperatures in the southern Andes in Peru. Thousands of alpacas have died in the region. Rodrigo Abd/AP hide caption
About 70 percent of Earth is covered by clouds at any given moment. Their interaction with climate isn't easy to study, scientists say; these shape-shifters move quickly. NOAA/Flickr hide caption
People cross a temporary bridge on a parched area of the Ganges River in Allahabad, India, on Thursday. Pacific Press/LightRocket via Getty Images hide caption
French Foreign Minister and President of the COP21 Laurent Fabius (center) gives a thumbs up while U.N. Secretary-General Ban Ki-moon (left) and French President Francois Hollande applaud after the final meeting of the U.N. conference on climate change in Le Bourget, France, on Saturday. Francois Mori/AP hide caption
Ousmane Ndiaye loves computer models, climate forecasting and babies. Here he holds farmer Mariami Keita's 4-month-old baby girl, Ndeye. Courtesy of Vanessa Meadu (CCAFS) hide caption
In 2007, Bernie Sanders took part in a Vermont walk for "Step It Up 2007," a movement aimed at reducing carbon emissions 80 percent by 2050. Alden Pellett/AP hide caption
Tex Toler watches the Llano River rise Friday in Llano, Texas, after another round of heavy rains that have brought flooding and deaths to the state. Jay Janner/TNS /Landov hide caption
A view of a phytoplankton bloom near Alaska's Pribilof Islands. The milky green and light blue shading of the water indicates the presence of vast populations of microscopic phytoplankton. NASA hide caption