14 [degrees] C per decade, while the atmosphere warmed
Greenhouse skeptics point out that the lower atmosphere up to 7 kilometers has not warmed over the last 20 years, since satellites started making measurements.
Still, people are most concerned about Earth's surface, which has warmed by almost 0.
Using a computer model of the tropical ocean, they artificially warmed
the climate and found that winds and ocean currents work to cool the eastern Pacific.
Graham's study delves even deeper to explain how the tropical ocean warmed
During the 1981 expedition, researchers discovered that the western portion of the Atlantic had warmed
by as much as several tenths of a degree Celsius since 1957.
The reduction in clouds warmed
the planet because more sunlight could reach its surface.
But an extensive study of temperatures over the Arctic Ocean indicates this region has not warmed
over the last four decades, a group of U.
Because temperature records indicate the Earth has warmed
over the last century, scientists must consider whether they have overestimated the influence of sulfates or smoke aerosols or both.
The report emphasizes a well-known point among climate experts: The world has not warmed
as quickly as computer climate models predicted it would.
A study of temperature records in the United States, China and the former Soviet Union indicates that these regions have warmed
over the last 40 years, but that most of the warming has occurred at night, with daytime temperatures staying about the same through the decades.
Evidence suggests that slight variations in Earth's orbit triggered the shifts and that greenhouse gases provided some of the force that cooled and warmed
the planet; during the ice ages, carbon dioxide levels dropped by more than 30 percent.