"Earth Day Network and Facebook are collaborating to engage people worldwide in environmental action through the Billion Acts of Green campaign. The two organizations have created a new application to motivate people to reduce their impact on the environment."

"Republicans say installing long-overdue pollution controls would harm economic recovery, while advocates claim the rules would create jobs and save lives."

"An American Indian tribe's efforts to win access to legal documents relating to the federal government's management of a tribal trust fund received a cool reception at the Supreme Court [Wednesday]."

"Bolivia [Wednesday] marked the International Day of Mother Earth with a ceremony in the Plaza Murillo, the center of political power. An ancient ritual shared center stage with speeches in which authorities in this Andean nation extolled the Law of Mother Earth - the world's first legislation that grants to all nature rights equal to humans."

"As he prepared to visit Chernobyl 25 years after the world's worst nuclear disaster, UN Secretary-General Ban Ki-moon outlined a five-step plan to strengthen global nuclear safety."

"Calmer winds and higher humidity on Wednesday gave the army of firefighters battling several major blazes in north and west Texas hope of halting the worst wildfires in the state's history."

"In February, the Obama administration declared the Pacific walrus to be at risk of extinction because its Arctic habitat was melting. But it declined to list the marine mammal as an endangered species, saying a backlog of other animals faced greater peril."

"A blowout at a natural gas well in rural northern Pennsylvania spilled thousands of gallons of chemical-laced water Wednesday, contaminating a stream and leading officials to ask seven families who live nearby to evacuate as crews struggled to stop the gusher."