Study Finds Global Dryland Ecosystems Are Increasingly Unstable

A new study published in Nature Climate Change details that dryland ecosystems, which cover 40% of the Earth's land surface, are becoming increasingly unstable. The research, led by Wen Zhang, analyzed four decades of satellite data to track changes in vegetation productivity. The study found that while rising atmospheric carbon dioxide stimulates growth in wet years, this masks severe year-to-year swings that leave these ecosystems highly vulnerable during dry years.

The research team concluded that roughly 80% of global drylands are experiencing escalating instability. This finding suggests that major global vegetation models may be overestimating dryland stability, which has implications for rain-fed agriculture.