this post was submitted on 26 Mar 2026
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Environment

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Every summer, people descend on the wildflower capital of Colorado to see grasslands flush with corn lilies, aspen sunflowers and sub-alpine larkspur. In January 1991, scientists set up a unique experiment in these Rocky Mountain meadows. It was one of the first (and longest running) to work out how the changing climate would affect an ecosystem.

At the time, it was believed a temperature increase could lead to longer, lusher grasses. But instead of flourishing, the grasses and wildflowers started to disappear, replaced by sage brush. The experimental meadows morphed into a desert-like scrubland. Even the fungi in the soils were transformed by heat.

The experiment provided a window into the future. These meadows will disappear in the coming decades if warming reaches 2C above preindustrial levels, according to the resulting article published in the Proceedings of the National Academy of Sciences. The findings are alarming, not just for Colorado, but for mountains across the planet as “shrubification” takes over.

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