'Once they're gone, they're gone': the fight to save the giant sequoia

A conservation group plans to buy the largest privately owned sequoia grove as the climate crisis threatens the species' future

Few living beings have experienced as much as the giant sequoias. With ancestors dating back to the Jurassic era, some of the trees that now grow along California's Sierra Nevada Mountains been alive for thousands of years, bearing witness to most of human history - from the fall of the Roman empire to the rise of Beyonci(C).

But a couple hundred years of human encroachment on to the sequoias' habitat, combined with the climate crisis, increasingly intense wildfires, and drought have threatened the species' future. The last of the world's most massive trees now live on just 73 groves scattered across the Sierras. Most lie within protected national parks such as Sequoia national park, where visitors flock from around the world to marvel at General Sherman, the world's most massive tree.