The world's unregarded forests are at risk. Intact forest is now being destroyed at an annual rate that threatens to cancel out any attempts to contain global warming by controlling greenhouse gas emissions.
Trees in the tropical regions are dying twice as fast as they did 35 years ago – and human-induced climate change is a factor.
And a third study has highlighted the value to humanity of intact forests, while estimating that four-fifths of the Earth’s remaining woodlands are now in some way degraded by human activities. “This figure,” researchers warn, “is probably an underestimate.”
All three studies confirm the value of forests to the planet – and underline the increasingly dangerous rate of loss.
An international team of researchers report in Nature Communications " Impact on short-lived climate forcers increases projected warming due to deforestationthat they made a computer model of the planet’s atmospheric conditions: they included natural and human-triggered aerosols, volatile organic compounds, greenhouse gases and other factors that influence temperature, one of which is albedo: the scientist’s word for the capacity of terrain to absorb or reflect solar radiation..read further from Climate News Network
They tested their model against the Earth’s temperature records since 1850 – and then ran it again, this time with a hypothetical forest-free world.
“The result was a significant rise of 0.8°C in mean temperature. In other words, today the planet would be almost 1°C warmer on average if there were no more forests,” said Paulo Artaxo, of the University of São Paulo in Brazil.
“If we go on destroying forests at the current pace – some 7,000 square kilometres per year in the case of Amazonia – in three to four decades, we’ll have a massive accumulated loss. This will intensify global warming regardless of all efforts to reduce greenhouse gas emissions.”
The second study, in the journal New Phytologist, "Drivers and mechanisms of tree mortality in moist tropical forests" is a reminder of just how complex the challenge of forest conservation can be.
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