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Carbon stored in landscapes for thousands of years is leaching back into the atmosphere via rivers, and human activity may be to blame

“There is a possibility that we’re disturbing these long-term carbon stores, and so, as a result, we’re seeing more old carbon coming out through this pathway,”

For example, rising temperatures caused by climate change could be triggering the release of carbon from thawing permafrost, or accelerating the rate of rock weathering. Other activities, such as the draining of peatlands or drying out of wetlands, could also be contributing. Dean stresses that more work is needed to determine the extent to which human activity is driving this process, and how the release of carbon is changing over time.

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