A drought that began in 1999 has affected the Colorado River Basin and is often called a megadrought. The river supplies water to seven US states and to Mexico. Scientists say the drought comes from rising temperatures and lower precipitation, especially reduced winter snow.
Researchers Jonathan Overpeck and Brad Udall report that the recent drop in precipitation is linked to human activity. They once thought the lower rainfall might be natural variability, but new data changed that view. Their updated graphs in this year's Colorado River Basin report show the long-term pattern will bring more dry winters than wet winters unless people act on climate change.
Difficult words
- drought — a long period with little or no rain
- megadrought — a very long dry period that affects regions
- basin — land area that drains water to a river
- precipitation — water that falls from clouds, like rain
- variability — the quality of changing up and down
- link — to show a connection between two thingslinked
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Related articles
Study warns of heavier rain and hotter nights in Tanzania
New research warns parts of Tanzania will see more extreme rainfall and rising temperatures. Experts say farmers, health and cities will be affected and call for stronger national policies, preparedness and community climate finance.
Alexandria’s coastal buildings at rising risk
A study in the journal Earth Future finds many buildings in Alexandria have collapsed in recent decades. Researchers link the damage to coastal erosion and rising sea levels and call for nature-based and technical defences.
Drug‑resistant Salmonella in children’s food and water in Karamoja
A peer‑reviewed study found drug‑resistant Salmonella in nearly half of food and water consumed by under‑fives in Karamoja. High resistance to azithromycin and other drugs raises health, economic and development concerns.
Indigenous rights and knowledge at COP30 in Belém
At COP30 in Belém (November 10–21, 2025), climate scientist Sineia Do Vale said securing Indigenous land rights and combining traditional knowledge with science is essential. Panelists urged funding and policy support after severe fires in Roraima in 2024.
Rwandan farmers boost harvests with climate-resilient seeds
The Seed Resilience Project, launched in 2023, helps Rwandan small-scale farmers access climate-resilient seeds. Field trials have shown much higher vegetable yields and farmers report better income and resilience.
Landslide destroys Tarsin village in Jebel Marra
A landslide hit the western Sudanese village of Tarsin on 31 August after days of heavy rain. Authorities recovered at least 375 bodies, many children; UN agencies say the death toll is unverified and search is difficult.