Climate change is accelerating red fire ant populations and it could spell trouble for agriculture worldwide: Invasive species present a considerable threat to our health, agriculture, and biodiversity — and red fire ants are among the world’s costliest to deal with. They’ve recently been found to have built up significant populations in Europe and are expected to cover 7 percent of the continent under current environmental conditions, according to a 2023 study. Their growth could have far-reaching consequences on the continent and beyond.

Invasive species come with a large price tag: Invasive alien species, a term used to describe non-native organisms introduced to new ecosystems by humans or human-related activity, reportedly costs the global economy some USD 423 bn per year, according to an Intergovernmental Science Policy Platform on Biodiversity and EcosystemServices (IPBES) report. These plants, mammals, and insects can wreak havoc on local ecosystems by introducing disease, preying on native flora and fauna, and destroying crops.

Fire ants are particularly pesky: The insects are estimated to cost the US around USD 1 bnannually. Separate studies have found red fire ants to be the fifth most expensive invasive species in the world, costing some EUR 20 bn in damage between 1970 and 2017. Their venomous sting often causes them to dominate local ant species and makes them especially dangerous to smaller amphibians, birds, and even fish — all of which contribute to the degradation of local ecosystems and ultimately our food systems, as well.

Climate change is driving the proliferation of invasive species. For fire ants, which trace their origins to South America, a warmer Europe makes for a far more forgiving climate for their populations to thrive. Already weakened ecosystems — a result of human encroachment along with climate change-based stressors — are also making it easier for these invasive species to multiply. Coastal Mediterranean towns are especially vulnerable due to their exposure to trans-continental trade and host climatic conditions ideally suited to their survival.

But it’s not all doom and gloom: Monitoring and early detection of invasive species — especially red fire ants — can help localities take preemptive action to mitigate their spread before populations balloon.

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