It was in New York City that a mysterious fungus was first spotted on an American chestnut, a blight that was to rapidly sweep across the eastern US, wiping out billions of the cherished trees. Now, 120 years later, there is fresh hope of a comeback for chestnuts, spurred not only by scientists but also eager New Yorkers planting blight-proof seeds in their back yards and local parks. The American chestnut was once found in vast numbers from Maine to Mississippi and known as the redwoods of the east due to its prodigious size. But 4bn trees were killed off
Hot droughts could push the Amazon into a hypertropical climate by 2100 – and trees wont survive
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