Damage To Forests From Global Warming Could Release Yet More Greenhouse Gases

"The critical role of forests as massive "sinks" for absorbing greenhouse gases is "at risk of being lost entirely" to climate change-induced environmental stresses that threaten to damage and even decimate forests worldwide, according to a new report released today. The report will be formally presented at the next session of the United Nations Forum on Forests (UNFF) taking place 20 April-1 May 2009 at the UN Headquarters in New York City.

"Adaptation of Forests and People to Climate Change – A Global Assessment" was coordinated by the Vienna-based International Union of Forest Research Organizations (IUFRO) through the Collaborative Partnership on Forests (CPF), an alliance of 14 international organizations that each has substantial forestry programs.

Authored by 35 of the world's top forestry scientists, it provides the first global assessment to date of the ability of forests to adapt to climate change and is expected to play a key role in next week's UNFF discussions. The report presents the state of scientific knowledge regarding the current and projected future impacts of climate change on forests and people along with options for adaptation.

While deforestation is responsible for about 20 percent of greenhouse gases, overall, forests currently absorb more carbon than they emit. The trees and soils of the world's forests are capturing and storing more than a quarter of the world's carbon emissions. The problem, scientists say, is that this critical carbon-regulating service could be lost entirely if the earth heats up 2.5 degrees Celsius (4.5 degrees Fahrenheit) or more relative to pre-industrial levels, which is expected to occur if emissions are not substantially reduced.

The study notes that the higher temperatures—along with the prolonged droughts, more intense pest invasions, and other environmental stresses that could accompany climate change—would lead to considerable forest destruction and degradation. This could create a dangerous feedback loop in which damage to forests from climate change significantly increases global carbon emissions which then exacerbate the greenhouse effect."

ORIGINAL SOURCE: EurekAlert!