"Christiana Figueres, the UN official who helped steer the Paris climate change accord to success in December, has entered the race to succeed Ban Ki-moon as the organisation’s next secretary-general."

"Bucking the trend of conserving cash at a time of low oil prices, the American oil giant Chevron said on Tuesday that it would go ahead with a $37 billion expansion of a gargantuan oil field on the Caspian Sea in Kazakhstan."

"A blue whale found tangled in plastic rope off California has become a symbol for a little-known but growing hazard faced by the ocean's largest creatures along the U.S. Pacific Coast - commercial crab traps dotting the sea floor and drifting astray by the thousands."

"Florida health officials confirmed 10 new Zika infections on Friday, the largest number of infections found on a single day and a sign of the United States’ faltering response to a looming crisis."

"SEABROOK, N.H. — The cod isn't just a fish to David Goethel. It's his identity, his ticket to middle-class life, his link to a historic industry."

"Nearly three decades after the world banned chemicals that were destroying the atmosphere’s protective ozone layer, scientists said Thursday that there were signs the atmosphere was on the mend."

"The long-finned, tiger-striped lionfish may be one of the most stunning swimmers in the sea — but it’s also becoming one of the most problematic."

"More than 100 Nobel laureates have signed a letter urging Greenpeace to end its opposition to genetically modified organisms (GMOs)."

"Just five months after the Zika virus was declared a global public health emergency, a scientific team’s feverish efforts to create a vaccine against the viral threat have borne promising fruit: With a single shot of either of two different types of vaccine, experimental mice gained near-total immunity to Zika for at least two months."

"Scientists have discovered a large helium gas field in Tanzania."