"After a century of decline, the world's total number of tigers has begun to rise, although conservation efforts for the endangered species still have a long way to go."

"After several weeks of study and debate, U.S. health officials concluded that infection with the Zika virus during pregnancy causes the birth defect microcephaly, a finding that experts hope will refocus attention on efforts to stop infections and prompt U.S. lawmakers to fund emergency prevention efforts."

"Peabody Energy Corp, the world's largest privately owned coal producer, filed for U.S. bankruptcy protection on Wednesday in the wake of a sharp fall in coal prices that left it unable to service a recent debt-fueled expansion into Australia."

"Scientists in Brazil have uncovered a new brain disorder associated with Zika infections in adults: an autoimmune syndrome called acute disseminated encephalomyelitis, or ADEM, that attacks the brain and spinal cord."

"Kim Cobb, a marine scientist at the Georgia Institute of Technology, expected the coral to be damaged when she plunged into the deep blue waters off Kiritimati Island, a remote atoll near the center of the Pacific Ocean. Still, she was stunned by what she saw as she descended some 30 feet to the rim of a coral outcropping."

"Global warming is shifting the way the Earth wobbles on its polar axis, a new NASA study finds."

"Reducing food waste around the world would help curb emissions of planet-warming gases, lessening some of the impacts of climate change such as more extreme weather and rising seas, scientists said on Thursday."

"Residents of Flint, Mich., may tell you lead is a serious menace, but for most of the last 5,000 years, people saw lead as a miracle metal at the forefront of technology."

"Trillions of dollars of non-bank financial assets around the world are vulnerable to the effects of global warming, according to a study on Monday that says tougher action to curb greenhouse gas emissions makes sense for investors."

"Sea levels could rise 50 cm (20 inches) more this century than had been expected, according to a report published on Wednesday which found that Antarctic ice will melt faster than previously thought."