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Caroline Kennedy, the US ambassador to Japan, tweeted that she was "deeply concerned" about the killing of dolphins in the notorious Taiji cove in that country.

"A propane shortage in the Midwest is raising concerns about residents who rely on the fuel for heating. The propane shortage has prompted a state of emergency in Ohio, as bitterly cold weather descends on the Midwest."

"A group of business leaders, energy experts and former government leaders believes that the Obama administration could tackle climate change by taking measures that do not require congressional approval, according to a report released on Tuesday."

"The average temperature of Earth maintained its warming trend in 2013, despite seasonal and regional variations that included a shrinking ice cap in the Arctic and a massively growing one in the southern hemisphere, U.S. scientists said on Tuesday."

"Yellowstone National Park managers have rejected a plan to use air rifles to shoot the nation's last herd of purebred bison with so-called biobullets containing a vaccine against a cattle disease, in a decision that has riled the U.S. livestock industry."

"There are more than a thousand species of sharks and rays in the world, and nearly a quarter of them are threatened with extinction, according to a new study. That means these ancient types of fish are among the most endangered animals in the world."

"The Arizona Supreme Court has greenlighted a lawsuit that the Hopi Tribe brought against the city of Flagstaff, Ariz. for selling wastewater to a local ski resort to make fake snow.

"The construction of the Keystone XL, a pipeline intended to bring hundreds of thousands of barrels a day of oil from Canada’s controversial oil sands to the United States, has been mired in delays as regulators assess its environmental impact, and activists and landowners protest what they see as one of the nation’s largest environmental threats."

"A rapidly mutating virus has leaped from plants to honeybees, where it is reproducing and contributing to the collapse of colonies vital to the multibillion-dollar agricultural industry, according to a new study."

"Governor Christie declined to sign a bill that would have required public notification whenever sewer-outfall pipes dump raw sewage into local rivers and bays, legislation that had received overwhelming support by both parties in the state legislature."