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An international team of university and NASA scientists examined the relationship between changes in surface temperature and vegetation growth from 45 degrees north latitude to the Arctic Ocean. Results show temperature and vegetation growth at northern latitudes now resemble those found 4 degrees to 6 degrees of latitude farther south as recently as Of the 10 million square miles 26 million square kilometers of northern vegetated lands, 34 to 41 percent showed increases in plant growth green and blue3 to 5 percent showed decreases in plant growth orange and redand 51 to 62 percent showed no changes yellow over the past 30 years.
Satellite data in this visualization are from the AVHRR and MODIS instruments, which contribute to a vegetation index that allows researchers to track changes in plant growth over large areas.
As a result of enhanced warming and a longer growing season, large patches of vigorously productive vegetation now span a third of the northern landscape, or more than 3. That is an area about equal to the contiguous United States.
This landscape resembles what was found to miles to kilometers to the south in Trees take hold as permafrost thaws near the Altai Mountains in Russia. Greening in the adjacent boreal areas is more pronounced in Eurasia than in North America.
An amplified greenhouse effect is driving the changes, according to Myneni.
Warming reduces the extent of polar sea ice and snow cover, and, in turn, the darker ocean and land surfaces absorb more solar energy, thus further heating the air above them.
These models show that increased temperatures in Arctic and boreal regions would be the equivalent of a degree latitude shift by the end of this century relative to a period of comparison from However, researchers say plant growth in the north may not continue on its current trajectory.
The ramifications of an amplified greenhouse effect, such as frequent forest fires, outbreak of pest infestations and summertime droughts, may slow plant growth. Also, warmer temperatures alone in the boreal zone do not guarantee more plant growth, which also depends on the availability of water and sunlight.
NEX is designed to bring scientists together with data, models and computing resources to accelerate research and innovation and provide transparency.Nearly all environmental scientists agree that Earth's atmosphere and climate are changing.
Most environmental scientists have concluded that human activity, particularly the emission of greenhouse gases, is the primary reason for this change.
Without the greenhouse effect, the Earth's temperature would be about −18 °C ( °F) compared to Earth's actual surface temperature of approximately 14 °C ( °F).  Carbon dioxide is believed to have played an important effect in regulating Earth's temperature throughout its billion year history.
April 2 (UPI) --For the first time, scientists have directly measured methane's growing greenhouse gas effect at Earth's benjaminpohle.com collected at a Department of Energy field observation site in. Climate forcing refers to a change in the Earth’s energy balance, leading to either a warming or cooling effect over time.
An increase in the atmospheric concentrations of greenhouse gases produces a positive climate forcing, or warming effect. The "greenhouse effect" is the warming that happens when certain gases in Earth's atmosphere trap heat.
These gases let in light but keep heat from escaping, like the glass walls of a greenhouse. Without its atmosphere and the greenhouse effect, the average temperature at the surface of the Earth would be zero degrees Fahrenheit.
However, too many greenhouse gases can cause the temperature to increase out of control.