There are about 2,000 dairy cows on Pete Olsen's fifth-generation farm in northern Nevada. A new milk processing plant is now putting pressure on Olsen and other dairy farmers to expand the size of their herds. But with the ongoing drought, farmers are struggling to get enough feed for the cows they already have. Kirk Siegler/NPR hide caption

itoggle caption Kirk Siegler/NPR

Out of the 330 species of turtles and tortoises, over half are threatened with extinction, says conservationist Eric Goode. Gloria Hillard/NPR hide caption

itoggle caption Gloria Hillard/NPR

Levees, like this one in New Orleans, must be certified by the U.S. Army Corps of Engineers before appearing on federal flood maps. This change has resulted in higher flood insurance premiums in some areas. Mario Tama/Getty Images hide caption

itoggle caption Mario Tama/Getty Images

Extreme drought conditions in California have state officials looking for alternative sources of water, including desalinated ocean water. Richard Vogel/AP hide caption

itoggle caption Richard Vogel/AP

Images of Folsom Lake, a reservoir in Northern California, show the severity of the state's drought. The photo at left, taken on July 20, 2011, show the lake at 97 percent of total capacity and 130 percent of its historical average for that date. The photo at right shows the lake on Jan. 16, 2014, when it was at 17 percent of capacity and 35 percent of its historical average. California Department of Water Resources hide caption

itoggle caption California Department of Water Resources

Cattle graze at a Brazilian Agricultural Research experimental farm in Planaltina in Goias state. To reduce emissions from deforestation, the Brazilian government is experimenting with grazing on integrated forest and pasture lands. Evaristo Sa/AFP/Getty Images hide caption

itoggle caption Evaristo Sa/AFP/Getty Images

Not all energy producers find fault with the EPA's rules. Calpine, which helped build the Delta Energy Center in Pittsburg, Calif., says the permitting regulations aren't overly cumbersome. JAKUB MOSUR/AP hide caption

itoggle caption JAKUB MOSUR/AP