In the last 20 years, forest regeneration has been so successful that trees now encompass an area larger than the size of France. Trillion Trees, a joint venture between WWF, BirdLife International and Wildlife Conservation Society, released a mapping study based on more than 30 years of data they collected. The information will help forest restoration projects worldwide determine where to focus action on fighting climate change. "We've known for a long time that natural forest regeneration is often cheaper, richer in carbon and better for biodiversity than actively planted forests, and this research tells us where and why regeneration is happening, and how we can recreate those conditions elsewhere," John Lotspeich, executive director of Trillion Trees, told the BBC.

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