Something significant is happening on the land. Across dozens of countries — from Ethiopia to Colombia, from India to Ireland — tree planting and natural forest restoration have accelerated to a pace that would have been difficult to imagine a decade ago.
In 2019, Ethiopia planted more than 350 million trees in a single day, setting a world record that has since been surpassed by the country’s own ongoing efforts. India has been planting hundreds of millions of saplings annually across degraded land. China’s decades-long Great Green Wall program has added more tree cover in recent years than any other country on earth. In Europe, natural regeneration is quietly reclaiming pasture and farmland as agricultural activity shifts.
The numbers behind the global effort are striking. The Bonn Challenge, launched in 2011, set a target of restoring 150 million hectares of degraded forest land by 2020 and 350 million hectares by 2030. More than 60 countries have committed to restoration pledges that collectively exceed those targets — representing an area larger than India.
Scientists are careful to distinguish between monoculture plantations and genuine ecological restoration. A hillside of identical eucalyptus trees is not the same as a returning forest of native species with rich understory and wildlife habitat. The quality of what gets planted matters enormously. But the growing body of restoration science — and the increasing sophistication of practitioners — is closing that gap.
Researchers at ETH Zurich estimated in a widely cited 2019 study that there is room on earth for an additional 900 million hectares of tree cover — land that was once forested and could be again, without displacing farmland or cities. The potential carbon storage implied by that figure is vast: enough, the researchers suggested, to capture two-thirds of the carbon humans have already released since the industrial revolution.
Tree planting alone will not solve climate change. Energy systems must also transform, and deforestation must stop before restoration efforts can outpace losses. But the surge of political, civic, and scientific attention on reforestation over the past decade represents a meaningful turn — a collective recognition that the world’s land can be a partner in the work ahead, not just a casualty of it.
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