Hay consumption strains Colorado River's water supply

In a revealing study, researchers pinpoint cattle-feed crops like alfalfa as major consumers of Colorado River's water, stirring debates on water use efficiency and sustainability.

Ian James reports for Los Angeles Times.


In short:

  • Cattle-feed crops, primarily alfalfa, account for 46% of the water diverted from the Colorado River, emphasizing agriculture's heavy water usage.
  • The study offers a comprehensive look at water distribution across the Western U.S. and Mexico, aiming to guide future water conservation efforts.
  • Agriculture's significant share of water use, compared to urban demands, highlights the urgent need for strategic crop management and conservation initiatives.

Key quote:

“It’s important to understand where all of the water goes. This is the first complete and detailed accounting.”

— Brian Richter, lead researcher

Why this matters:

Alfalfa, known for its high water needs, is a key crop in the agricultural profile of states like Arizona and California, both of which rely heavily on the Colorado River for irrigation. The crop's cultivation consumes more water than any other in California, and it's a major user in Arizona as well, states that are already facing water allocation challenges due to the river's overextension.

Climate change—and the subsequent increase in droughts, flooding, and extreme heat—has held back agricultural gains and impeded global food security efforts.

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Leading cardiology societies call for stronger protections against environmental hazards
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Leading cardiology societies call for stronger protections against environmental hazards

Four international cardiology societies — the American Heart Association, the American College of Cardiology, the European Society of Cardiology, and the World Heart Federation — issued a joint statement urging for regulatory action to address the role of toxic environmental exposures in cardiovascular disease.


In short:

  • Growing evidence shows environmental exposures — including air pollution, chemical pollution, plastics, climate change, and artificial noise and light — may be contributing significantly to the rise in cardiovascular disease.
  • Of these hazards, air pollution poses the greatest risk, likely by causing inflammation in the lungs and throughout the circulatory system.
  • The multiple hazards associated with climate change like extreme heat and wildfires may also threaten cardiovascular health via dehydration, arrhythmia, and severe coronary events (such as heart attacks).


Key quote:

"A unified voice was needed to state clearly that the science is settled—and that continued inaction reflects political and structural inertia rather than scientific uncertainty.”

- Lead study author Dr. Thomas Münzel, via JAMA Medical News


Why this matters:

Cardiovascular disease is the leading cause of death worldwide, contributing to roughly 44% of deaths from noncommunicable diseases. When speaking with JAMA Medical News, lead author Dr. Münzel contributed at least 1 in 5 of the 20 million annual global cardiovascular disease deaths to environmental hazards. The authors of this statement call on both policymakers and clinicians to address environmental exposures “with the same seriousness as traditional cardiovascular risks,” fully integrating them into regulations and patient care.


Related EHN coverage:


More resources:


Münzel, T. et al. (2026). Environmental Stressors and Cardiovascular Health: Acting Locally for Global Impact in a Changing World: A Statement of the European Society of Cardiology, the American College of Cardiology, the American Heart Association, and the World Heart Federation. Circulation

Anderer, S. (2026). Cardiology Societies Urge Action on Environmental Risk Factors. JAMA Medical News
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