Forests provide a buffer against climate change because of the vast amounts of carbon dioxide that they absorb and their rapid destruction is putting global climate targets at risk, WRI analysts said in a briefing.

The high level of 2021 forest loss, while roughly flat with 2020, does not match up with the commitment announced by more than 100 world leaders at a United Nations climate summit last November to halt deforestation by 2030, the analysts said.

"We are not seeing the downward decline (in forest loss) we would expect to see those results," said Rod Taylor, WRI's global forests program director, referring to the 2030 commitment.

The causes of the reduction in forest cover include human and natural causes, as well as deforestation, wildfires and other destruction.

Loss of 37,500 square kilometers of old-growth tropical rainforest is particularly concerning because the dense vegetation holds high levels of carbon, WRI analysts said.

Although that destruction was slightly lower than 2020, it caused carbon dioxide emissions equivalent to all of the fossil fuel India burns in a year, the report said.

That destruction was overwhelmingly from human's permanently clearing the land, with more than 40 per cent of that loss in Brazil.

Cold boreal forests found in the far northern regions like Canada, Russia and Alaska lost more than 80,000 square kilometers of area last year, the highest level since records began in 2001.

The majority of that loss was due to record fires in Russia, driven by hotter and drier conditions that are likely linked to climate change, the report said.

"It's hugely worrying," Taylor said.

"We're seeing fires burning more frequently, more intensively and more broadly than they ever would under normal conditions."

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