Frogs, toads, newts, salamanders and other cold-blooded creatures living in moist settings are acutely vulnerable to changes in their environment.
As they breathe through their skin and have no feathers, hair or scales for protection, extreme heat linked to climate change means they dehydrate quickly and lose breeding sites that need moisture.
More frequent, intense and longer storms, floods and higher sea levels can destroy their forest habitats and breeding grounds.
"In many cases these changes are happening too quickly for them to adapt," said Kelsey Neam, of the Amphibian Specialist Group at the International Union for Conservation of Nature's (IUCN) Species Survival Commission.
"Climate change is an underestimated threat to amphibians" and will become "more evident" as more data emerges going forward, she added, predicting "an exponential effect".
"We expect climate change to push species closer to extinction," Neam told AFP.
A landmark 2004 study, the Global Amphibian Assessment, showed amphibians were the world's most threatened vertebrates.
In a paper published in the journal Nature on Wednesday, researchers built on a second such study published last year that evaluated 8,011 species for the IUCN Red List.
They found almost 41 percent of amphibians were globally threatened, defined as appearing under the list's "critically endangered", "endangered" and "vulnerable" categories.
That represented a deterioration from 37.9 percent in 1980 and 39.4 percent in 2004.
Climate change was the main driver of 39 percent of status declines from 2004 to 2022, affecting 119 species, with habitat loss and degradation at 37 percent.
Climate change can also exacerbate other threats such as fires, disease and land use change, the authors noted.
Habitat loss and damage linked to agriculture, infrastructure development and other industries remained the most common threat but did not primarily drive as many status deteriorations.
In contrast, habitat loss and disease -- especially the chytrid fungus, which devastated amphibians worldwide starting in the late 1990s -- were responsible for 91 percent of status deteriorations between 1980 and 2004, with just one percent primarily due to climate change.
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Threatened species were concentrated most in Caribbean islands, Mesoamerica, the tropical Andes, Cameroon, Nigeria, Madagascar, India's Western Ghats mountain range and Sri Lanka.
Salamanders and newts were the most affected species.
For example, five US salamander species have experienced status declines due to fires and less humid soils caused by droughts and wildfires that scientists say climate change has exacerbated.
In parts of Australia and Brazil, reduced rainfall linked to climate change is predicted to threaten the reproduction of frogs that depend on high levels of moisture in the soil and fallen leaves to prevent their eggs drying up.
The authors called for greater investment and policy responses to support amphibians, which play a key role in ecosystems and can help fight climate change.
They are prey for mammals, birds and reptiles, contribute to recycling nutrients and help sustain the food web, which would collapse without them, said Neam, who highlighted the urgency of protecting habitats and slashing carbon emissions.
"By protecting amphibians, we are protecting the forests and ecosystems that are key, nature-based solutions to battling climate change," she told AFP.
"An investment in amphibians is an investment in the future of our planet."
Amphibians' small distribution often makes them more vulnerable to extinction than other vertebrates, but that can also facilitate conservation efforts, said study co-author Jennifer Luedtke, of the IUCN's Amphibian Specialist Group.
Improved habitat protection and management played major roles in species who improved their category between 2004 and 2022, Neam added.
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