California has released a plan outlining how it thinks states should reduce their reliance on the Colorado River.

Tree Town’s efforts to reduce lead pipes around the city have received praise from the White House.

Researchers say that the population of western monarch butterflies wintering along the California coast has rebounded for a second year in a row.

General Motors has conditionally agreed to invest $650 million in Lithium Americas in a deal that will give GM exclusive access to the first phase of a mine planned near the Nevada-Oregon line with the largest known source of lithium in the U.S. The equity investment the companies announced jointly Tuesday is contingent on the project clearing the final environmental and legal challenges it faces in federal court in Reno, where conservationists and tribes are suing to block it.

Satellites, drones and airplanes equipped with infrared cameras will likely be the backbone of a new federal policy to fine the nation’s largest methane polluters.

Federal environmental regulators have blocked a proposed Alaska mine heralded by backers as the most significant undeveloped copper and gold resource globally.