President Obama (center) and Secretary of State John Kerry (right) attend Monday's opening ceremony of the United Nations Climate Change Conference in the Paris suburb of Le Bourget. Thibault Camus/AP hide caption

toggle caption Thibault Camus/AP

After a magnitude-4.5 earthquake was recorded near Cushing in October, Oklahoma regulators ordered oil companies to shut down several disposal wells. That seemed to slow the shaking — at least for a while. Joe Wertz/StateImpact Oklahoma hide caption

toggle caption Joe Wertz/StateImpact Oklahoma

Delegates from about 170 countries gathered in Kyoto in December 1997 during the United Nations Framework Convention on Climate Change. This year in Paris, the stakes are even higher, negotiators say. AFP/Getty Images hide caption

toggle caption AFP/Getty Images

Coal fires burn early in the morning in January 2014 at a privately owned coal mine in India's Jharkand state, making the air dense with noxious smoke and dust. Forty percent of India's mineral wealth lies in Jharkhand. Johnny Haglund hide caption

toggle caption Johnny Haglund

The Beijing Environment Exchange, one of seven emissions trading pilot programs in China, may be part of a nationwide carbon market by as early as 2017. Anthony Kuhn/NPR hide caption

toggle caption Anthony Kuhn/NPR

Gov. Jerry Brown (left) meets with Prime Minister of India Narendra Modi in San Jose, Calif., on Sept. 27. Brown has been brokering his own international agreement on climate change. Jeff Chiu/AP hide caption

toggle caption Jeff Chiu/AP

The average wholesale price of turkeys was $1.35 per pound in mid-November. But the retail price of frozen tom turkeys has fallen to an average of 87 cents a pound. Why? Because grocers know cheap turkeys draw customers into the store. Larry Crowe/AP hide caption

toggle caption Larry Crowe/AP