内容摘要：EDITOR’S NOTE: This is part of a series of on how tribes and Indigenous communities are coping with and combating climate change.

EDITOR’S NOTE: This is part of a series of on how tribes and Indigenous communities are coping with and combating climate change.

— falling in large steps and plateaus — since 1979, according to the National Snow and Ice Data Center. While Arctic sea ice hiton record for late August, in Western Hudson Bay unusual winds have meant longer lasting ice than usual, but it’s a temporary and very localized respite.

Fireweed grows near the Hudson Bay, Sunday, Aug. 4, 2024, in Churchill, Manitoba. (AP Photo/Joshua A. Bickel)Fireweed grows near the Hudson Bay, Sunday, Aug. 4, 2024, in Churchill, Manitoba. (AP Photo/Joshua A. Bickel)A sign alerts drivers to potential polar bears, Wednesday, Aug. 7, 2024, in Churchill, Manitoba. (AP Photo/Joshua A. Bickel)

A sign alerts drivers to potential polar bears, Wednesday, Aug. 7, 2024, in Churchill, Manitoba. (AP Photo/Joshua A. Bickel)this year from Stroeve and York looked at sea ice levels, that 180-day hunger threshold and climate simulations based on different levels of carbon pollution. The researchers found that once Earth warms another 1.3 or 1.4 degrees Celsius (2.3 to 2.5 degrees Fahrenheit) from now, the polar bears likely will cross that point of no return. Bears will be too hungry and this population likely dies out.

that look at current efforts to curb carbon dioxide emissions project warming of about 1.5 degrees to 1.7 degrees Celsius (2.7 to 3.1 degrees Fahrenheit) from now by the end of the century.

“The populations will definitely not make it,” Stroeve said.A man walks by abandoned houses in Chanaute Market, Melamchi, northeast of Kathmandu, Nepal, Sunday, Sept. 15, 2024, damaged by floods in 2021. (AP Photo/Niranjan Shrestha)

A man walks by abandoned houses in Chanaute Market, Melamchi, northeast of Kathmandu, Nepal, Sunday, Sept. 15, 2024, damaged by floods in 2021. (AP Photo/Niranjan Shrestha)The sand-filled entrance of a house is visible in Chanaute Market, Melamchi, northeast of Kathmandu, Nepal, Sunday, Sept. 15, 2024, that was damaged by floods in 2021. (AP Photo/Niranjan Shrestha)

The sand-filled entrance of a house is visible in Chanaute Market, Melamchi, northeast of Kathmandu, Nepal, Sunday, Sept. 15, 2024, that was damaged by floods in 2021. (AP Photo/Niranjan Shrestha)Abandoned houses are visible in Chanaute Market, northeast of Kathmandu, Nepal, Sunday, Sept. 15, 2024. (AP Photo/Niranjan Shrestha)