The world’s forests are doing much better than we think

hink of a planet in the grip of climate crisis, and many of the images in your mind will be carved from wood. Forests in Canada and Australia going up in flames; loggers in the jungles of Indonesia and Brazil chain-sawing ancient trees for lumber; monocultural fir plantations marching in geometric order up the hillsides of Scotland or Sweden.
You might be surprised to discover, then, that many of the world’s woodlands are in a surprisingly good condition. The destruction of tropical forests gets so much (justified) attention that we’re at risk of missing how much progress we’re making in cooler climates.
That’s a mistake. The slow recovery of temperate and polar forests won’t be enough to offset global warming, without radical reductions in carbon emissions. Even so, it’s evidence that we’re capable of reversing the damage from the oldest form of human-induced climate change — and can do the same again.

Take England. Forest coverage now is greater than at any time since the Black Death nearly 700 years ago, with some 1.33 million hectares of the country covered in woodlands. The UK as a whole has nearly three times as much forest as it did at the start of the 20th century.
That’s not by a long way the most impressive performance. China’s forests have increased by about 607,000 square kilometers since 1992, a region the size of Ukraine. The European Union has added an area equivalent to Cambodia to its woodlands, while the US and India have together planted forests that would cover Bangladesh in an unbroken canopy of leaves.

Logging in the tropics means that the world as a whole is still losing trees. Brazil alone removed enough woodland since 1992 to counteract all the growth in China, the EU and US put together. Even so, the planet’s forests as a whole may no longer be contributing to the warming of the planet. On net, they probably sucked about 200 million metric tons of carbon dioxide from the atmosphere each year between 2011 and 2020, according to a 2021 study. The CO2 taken up by trees narrowly exceeded the amount released by deforestation. That’s a drop in the ocean next to the 53.8 billion tons of greenhouse gases emitted in 2022 — but it’s a sign that not every climate indicator is pointing toward doom.Remarkably, this may not be the first time human activities caused an expansion of the world’s forests. The devastating population declines caused by war and disease after the European colonization of the Americas may have caused a downturn in global temperatures between the 16th and 19th centuries, according to one 2019 analysis. With their populations reduced to about 10% of previous numbers, Indigenous people were no longer able to maintain agricultural systems based on clearing land with fire. As a result, 558,000 square kilometers of new woodlands grew, sufficient to lock away about 27 billion tons of CO2.

Nor is global afforestation to date caused mainly by environmental imperatives. Indeed, in much of the world, it has been the rise of fossil fuels that turned the corner on deforestation almost a century ago, as industries turned to coal, oil and gas to produce heat and energy in place of wood.
More than a quarter of Japan is covered with planted forests that in many cases are so old they’re barely recognized as such. Forest cover reached its lowest extent during World War II, when trees were felled by the million to provide fuel for a resource-poor nation’s war machine. Akita prefecture in the north of Honshu island was so denuded in the early 19th century that it needed to import firewood. These days, its lush woodlands are a major draw for tourists.

It’s a similar picture in Scandinavia and Central Europe, where the spread of forests onto unproductive agricultural land, combined with the decline of wood-based industries and better management of remaining stands, has resulted in extensive regrowth since the mid-20th century. Forests cover about 15% of Denmark, compared to 2% to 3% at the start of the 19th century.

Even tropical deforestation has slowed drastically since the 1990s, possibly because the rise of plantation timber is cutting the need to clear primary forests. Still, political incentives to turn a blind eye to logging, combined with historically high prices for products grown and mined on cleared tropical woodlands such as soybeans, palm oil and nickel, mean that recent gains are fragile.

There’s no cause for complacency in any of this. The carbon benefits from forests aren’t sufficient to offset more than a sliver of our greenhouse pollution. The idea that they’ll be sufficient to cancel out gross emissions and get the world to net zero by the middle of this century depends on extraordinarily optimistic assumptions on both sides of the equation.

Still, we should celebrate our success in slowing a pattern of human deforestation that’s been going on for nearly 100,000 years. Nothing about the damage we do to our planet is inevitable. With effort, it may even be reversible.