Skip to main content

Sign up for our newsletter.

Quality journalism. Progressive values. Direct to your inbox.

Corporate gatekeepers and big tech monopolists are making it more difficult than ever for independent media to survive. Please chip in today.

The yellow fever mosquito (Aedes aegypti)

The yellow fever mosquito (Aedes aegypti) takes a bloodmeal. (Photo: James Gathany/CDC)

Climate Crisis Could Expose Half a Billion More People to Tropical Mosquito-Borne Diseases by 2050

"Climate change is going to kill a lot of people. Mosquito-borne diseases are going to be a big way that happens."

Jessica Corbett

Rising global temperatures could put half a billion more people at risk for tropical mosquito-borne diseases like chikungunya, dengue, yellow fever, and Zika by 2050, according to a new study.

"We've seen dengue showing up in Hawaii and Florida, then we saw Zika arrive in Florida and really grab public attention."
—Sadie Ryan, lead author

While a growing body of recent research warns the human-caused climate crisis will cause general worldwide "environmental breakdown," a study published Thursday in the journal PLOS Neglected Tropical Diseases focuses specifically on a related public health threat: how a hotter world will enable disease-carrying mosquitoes to reach more people.

The study's lead author Sadie Ryan of the University of Florida—joined by researchers from Georgetown University, Stanford University, and Virginia Tech—examined how projected temperature rise for 2050 and 2080 could impact the global distribution of the yellow fever mosquito (Aedes aegypti) and the tiger mosquito (Aedes albopictus).

The team estimates that currently, about six billion people are exposed for a month or more annually to climates suitable for those mosquitoes to transmit diseases. As temperatures climb, colder regions such as parts of Canada and Northern Europe will become more hospitable to mosquitoes, at the human population's expense.

"Plain and simple, climate change is going to kill a lot of people," coauthor Colin Carlson of Georgetown told Nexus Media News. "Mosquito-borne diseases are going to be a big way that happens, especially as they spread from the tropics to temperate countries."

Lead author Ryan emphasized that public health experts should be preparing now for the outbreaks predicted to occur in new places over the next few decades. As the study explains:

Aedes-borne virus expansion into regions that lack previous exposure is particularly concerning, given the potential for explosive outbreaks when arboviruses are first introduced into naïve populations, like chikungunya and Zika in the Americas. The emergence of a Zika pandemic in the Old World, the establishment of chikungunya in Europe beyond small outbreaks, or introduction of dengue anywhere a particular serotype has not recently been found, is a critical concern for global health preparedness.

"These diseases, which we think of as strictly tropical, have been showing up already in areas with suitable climates," Ryan noted, "because humans are very good at moving both bugs and their pathogens around the globe."

For example, she told Nexus, "We've seen dengue showing up in Hawaii and Florida, then we saw Zika arrive in Florida and really grab public attention."

"Facing something as massive as climate change gives us a chance to rethink the world's health disparities, and work towards a future where fewer people die of preventable diseases like these."
—Colin Carlson, coauthor

While the study echoes warnings from past papers, Carlson pointed out the limitations of their research—especially given the rapid rate at which the planet is already warming.

"We've only managed to capture the uncertain futures for two mosquitoes that spread a handful of diseases — and there's at least a dozen vectors we need this information on," he said. "It's very worrisome to think how much these diseases might increase, but it's even more concerning that we don't have a sense of that future. We have several decades of work to do in the next couple years if we want to be ready."

Though their findings suggest a bleak future, Carlson was also optimistic about the potential for broader public health reforms.

"Facing something as massive as climate change gives us a chance to rethink the world's health disparities, and work towards a future where fewer people die of preventable diseases like these," he concluded. "Facing climate change and tackling the burden of neglected tropical diseases go hand-in-hand."


Our work is licensed under Creative Commons (CC BY-NC-ND 3.0). Feel free to republish and share widely.

We've had enough. The 1% own and operate the corporate media. They are doing everything they can to defend the status quo, squash dissent and protect the wealthy and the powerful. The Common Dreams media model is different. We cover the news that matters to the 99%. Our mission? To inform. To inspire. To ignite change for the common good. How? Nonprofit. Independent. Reader-supported. Free to read. Free to republish. Free to share. With no advertising. No paywalls. No selling of your data. Thousands of small donations fund our newsroom and allow us to continue publishing. Can you chip in? We can't do it without you. Thank you.

'A Slap in the Face to Voters': Kansas Supreme Court Upholds GOP Map

"This case is only one skirmish in the wholesale assault on democracy in Kansas and around the country," said the head of the state's ACLU.

Jessica Corbett ·


'Major Milestone' as Rhode Island Expands Voting Rights

A newly passed measure was praised as "a huge step forward in improving and modernizing voting in the Ocean State."

Andrea Germanos ·


PA Primary Is Too Close to Call, But Trump Says 'Dr. Oz Should Declare Victory' Anyway

"This is why we keep saying Trump is a clear and present danger to democracy."

Kenny Stancil ·


'Entirely Reckless': Critics Blast EU Plan to Boost Gas Infrastructure

"Deepening its own dependence on volatile fossil fuels" in response to Russia's attack on Ukraine, said one campaigner, "is the last thing Europe should be doing."

Jessica Corbett ·


Sanders Applauds Denton, Texas for Passing 100th Local Resolution Backing Medicare for All

"The way we will pass Medicare for All," said Sen. Bernie Sanders, "is by continuing to build a strong grassroots movement that is prepared to take on the big money interests."

Jake Johnson ·

Common Dreams Logo