One in six species could disappear as the climate warms over the next century, with animals and plants in South America particularly hard hit while those in North America  would face the lowest risk, according to a major new analysis published Thursday.

With naturally small populations of native species in its tropical rainforests and mountains, South America could see extinction rates more than four times higher than those in the United States and Canada, according to the study published in the journal Science.

In Australia and New Zealand, where the ability of plants and animals to shift to new locations is constrained by oceans, the percentage of extinctions could be more than double North America’s.

“This is evidence that we’re pushing the