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The Hantavirus Is Also a Climate Warning

Higher temperatures, like this coming summer’s, bring more infectious diseases.

Passengers watch as unseen health personnel assists patients onto a boat from the cruise ship MV Hondius, while stationary off the port of Praia, the capital of Cape Verde, on May 6, 2026. Evacuations were taking place because of a deadly outbreak of hantavirus.

The signs now are that the hantavirus is not the next pandemic. But with 2026 predicted to be the hottest year on record, the hantavirus outbreak is a warning of what public health experts have long said: A hotter planet is a deadlier planet.

Rising global temperatures and the impacts they trigger—harsher heat waves, stronger storms, and wider spread of infectious diseases—endanger human health in myriad ways. The world’s top medical societies have been sounding the alarm since 2009, when the journal The Lancet called climate change “the biggest global health threat of the 21st century.” The Lancet’s 2025 report found that climate change is responsible for “millions of unnecessary deaths a year,” with excess heat alone killing 546,000 people.

The Associated Press and CNN appear to be the first major news organizations to make the climate connection to the hantavirus outbreak on a cruise ship that departed Argentina on April 1. CNN reported that hantavirus has long been present in the far south of South America, but its frequency has increased recently in Argentina, where cases “have almost doubled in the past year, with the country recording 32 deaths alongside its highest number of infections since 2018,” according to the Argentine health ministry. Citing local public health researchers, the AP reported that “higher temperatures expand the........

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