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If A Tree Falls In The Forest, And No One Is Around To Hear It, Does Climate Change?

Date:
June 13, 2008
Source:
National Science Foundation
Summary:
There are roughly 42 million square kilometers of forest on Earth, a swath that covers almost a third of the land surface, and those wooded environments play a key role in both mitigating and enhancing global warming.

Earth hosts roughly 42,000,000 square kilometers of forest, about one third of the land area.
Credit: Nicolle Rager Fuller, National Science Foundation

There are roughly 42 million square kilometers of forest on Earth, a swath that covers almost a third of the land surface, and those wooded environments play a key role in both mitigating and enhancing global warming.

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In a review paper appearing in the Forest Ecology special issue of Science, atmospheric scientist Gordon Bonan of the National Science Foundation's National Center for Atmospheric Research in Boulder, Colo., presents the current state of understanding for how forests impact global climate.

"As politicians and the general public become more aware of climate change, there will be greater interest in legislative policies to mitigate global warming," said Bonan. "Forests have been proposed as a possible solution, so it is imperative that we understand fully how forests influence climate."

The teeming life of forests, and the physical structures containing them, are in continuous flux with incoming solar energy, the atmosphere, the water cycle and the carbon cycle--in addition to the influences of human activities. The complex relationships both add and subtract from the equations that dictate the warming of the planet.

"In the Amazon, tropical rainforests remove carbon dioxide from the atmosphere," said Bonan. "This helps mitigate global warming by lowering greenhouse gas concentrations in the atmosphere. These forests also pump moisture into the atmosphere through evapotranspiration. This cools climate and also helps to mitigate global warming."

While even the earliest European settlers in North America recognized that the downing of forests affected local climates, the global impact of such activities has been uncovered over more recent decades as new methods, analytical tools, satellites and computer models have revealed the global harm that forest devastation can cause.

As studies have explored the mechanisms behind these effects, and the effects themselves, researchers have come to recognize that calculating the specific harm from a specific local impact is a highly complicated problem.

"We need better understanding of the many influences of forests on climate, both positive and negative feedbacks, and how these will change as climate changes," said Bonan. "Then we can begin to identify and understand the potential of forests to mitigate global warming."


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The above story is based on materials provided by National Science Foundation. Note: Materials may be edited for content and length.


Cite This Page:

National Science Foundation. "If A Tree Falls In The Forest, And No One Is Around To Hear It, Does Climate Change?." ScienceDaily. ScienceDaily, 13 June 2008. <www.sciencedaily.com/releases/2008/06/080612171111.htm>.
National Science Foundation. (2008, June 13). If A Tree Falls In The Forest, And No One Is Around To Hear It, Does Climate Change?. ScienceDaily. Retrieved December 20, 2014 from www.sciencedaily.com/releases/2008/06/080612171111.htm
National Science Foundation. "If A Tree Falls In The Forest, And No One Is Around To Hear It, Does Climate Change?." ScienceDaily. www.sciencedaily.com/releases/2008/06/080612171111.htm (accessed December 20, 2014).

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