University of Arizona researchers released a new report of how the COVID-19 pandemic has affected the food system right here in Tucson.

California and partners will launch two satellites by 2023 to spot and monitor plumes of carbon dioxide (CO2) and methane – with dozen more to follow if all goes right. The elimination of these planet-warming greenhouse gases is essential to curbing climate change.

Marc Johnson saw trouble in the water.

The Southwest has grown hotter and drier during the past decade, and new climate data from the federal government shows these changes have been dramatic, shifting the long-term averages that represent the region’s “normal.”

The recent pledges made by world governments to limit carbon emissions will not be sufficient to meet the goal of keeping global temperatures from rising above 1.5 degrees Celsius, a new report concluded. Instead, those nonbinding commitments will result in a rise in the average global temperature to a potentially catastrophic 2.4 degrees Celsius. 

Climate change has changed the way a lot of us think about the future, but for what seems like a growing number of young people, it’s changing something fundamental: Their decision to have children.

Opinion: Arizona has plans in place to lessen the pain of a Colorado River shortage. But a key component - wells for farmers - remains highly uncertain.

Researchers say climate change is posing significant challenges for farmers across the country and could have an impact on food production in years to come.

The US Bureau of Reclamation last week warned water users to brace for a 500,000 acre-foot cut in water from the Colorado River as a historic drought continues to tighten its grip on the Southwest.

The US Bureau of Reclamation last week warned water users to brace for a 500,000 acre-foot cut in water from the Colorado River as a historic drought continues to tighten its grip on the Southwest.

An agreement with Tucson Electric Power will reduce the University of Arizona's carbon footprint by one-third and save the university millions of dollars over the agreement's 20-year life.