"President Obama should press Chinese President Xi Jinping to curb emissions of a short-lived, but highly potent heat-trapping pollutant when the leaders meet this week in California, a group of House and Senate Democrats wrote Wednesday to Obama."

"Migration used to be a good strategy for animals to find the best food, but a recent study appears to show that climate change and human interference favor animals that stay put."

"As Secretary of State John Kerry lauded Polish Foreign Minister Radoslaw Sikorski in Washington, D.C., yesterday for his country's hosting of this year's U.N. climate change summit, activists lambasted the Eastern European nation as a climate scoundrel."

"Climate change threatens most of California's native freshwater fish -- many of which don't exist anywhere else in the world -- with extinction, a new study says."

"MELROSE PARK, Ill. — From the roof of the Gottlieb Memorial Hospital in the Chicago suburbs, an 83-year-old retired doctor finds troubling evidence of why so many people are sneezing and itching their eyes."

"Shipping along the Arctic northern sea route is set to grow more than 30-fold over the next eight years and could account for a quarter of the cargo traffic between Europe and Asia by 2030, experts said on Wednesday."

"In the news business, an evergreen is a story that doesn't have to run on a particular day, but can stay fresh for a long time."

"In the tropics at heights more than 10 miles above the surface, the prevailing winds alternate between strong easterlies and strong westerlies roughly every other year. This slow heartbeat in the tropical upper atmosphere, referred to as the quasibiennial oscillation (QBO), impacts the winds and chemical composition of the global atmosphere and even the climate at Earth's surface."

"Organizing for Action -- a group that formed out of President Obama's re-election campaign -- has posted five tweets in the past week about climate change using the Twitter account."

"SWARTHMORE, Pa. -- Student activists at more than 200 colleges are trying a new tactic in hopes of slowing the pace of climate change: They are asking their schools to stop investing in fossil fuel companies."

"Until an outbreak of tornadoes in the past week, this year had been a relatively quiet one for twisters in the Midwest and Plains states."

"The Ogallala Aquifer suffered its second-worst drop since at least 2000 in a large swath of the Texas Panhandle, new measurements show."

"Pinning the deadly tornado in the US state of Oklahoma on climate change is wrongheaded, even though the world is set to see a rise in high-profile weather disasters due to global warming, the leader of a UN body said Tuesday."

"Residents of Manhattan will not just sweat harder from rising temperatures in the future, says a new study; many may die."

"Forecast global temperature rise of 4C a calamity for large swaths of planet even if predicted extremes are not reached."