Researchers match recent and future climates to show what American cities will be like in 60 years.
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.