Escaped methane likely warms the climate as much as all natural gas burned in the U.S.
Researchers found that efforts to curtail tourism-related emissions have been outpaced by the industry's growth.
Considering humidity as well as temperature emphasizes humanity's impact on the climate.
Scientists can now link "acts of God" to climate change. That could give victims the power to hold someone accountable, say lawyers.
John Bates stands by accusations that 2015 study was rushed and biased, but says he only guessed that motivations were political.