Click the link to read the article on the CNN website (Laura Paddison). Here’s an excerpt:
October 16, 2024
Humanity has thrown the global water cycle off balance “for the first time in human history,” fueling a growing water disaster that will wreak havoc on economies, food production and lives, according to a landmark new report. Decades of destructive land use and water mismanagement have collided with the human-caused climate crisis to put “unprecedented stress” on the global water cycle, said the report published Wednesday by the Global Commission on the Economics of Water, a group of international leaders and experts.
Disruptions to the water cycle are already causing suffering. Nearly 3 billion people face water scarcity. Crops are shriveling and cities are sinking as the groundwater beneath them dries out. The consequences will be even more catastrophic without urgent action. The water crisis threatens more than 50% of global food production and risks shaving an average of 8% off countries’ GDPs by 2050, with much higher losses of up to 15% projected in low-income countries, the report found.
“For the first time in human history, we are pushing the global water cycle out of balance,” said Johan Rockström, co-chair of the Global Commission on the Economics of Water and a report author. “Precipitation, the source of all freshwater, can no longer be relied upon.”
The report differentiates between “blue water,” the liquid water in lakes, rivers and aquifers, and “green water,” the moisture stored in soils and plants. While the supply of green water has long been overlooked, it is just as important to the water cycle, the report says, as it returns to the atmosphere when plants release water vapor, generating about half of all rainfall over land. Disruptions to the water cycle are “deeply intertwined” with climate change, the report found. A stable supply of green water is vital for supporting vegetation that can store planet-heating carbon. But the damage humans inflict, including destroying wetlands and tearing down forests, is depleting these carbon sinks and accelerating global warming. In turn, climate change-fueled heat is drying out landscapes, reducing moisture and increasing fire risk.