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Two of California's most treasured natural settings are also among the most imperiled landscapes on Earth, as disruptive changes in climate patterns promise to melt glaciers, dry out rivers and set forests ablaze in coming generations, says a coalition of conservation, sporting and community groups.

Unless people significantly alter the way they manage water supplies and fuel their cars and homes, the Sierra Nevada and Sacramento-San Joaquin River Delta will become increasingly hostile to already-dwindling wildlife and fish species, the Endangered Species Coalition said in a report released Wednesday.

Likewise for the Hawaiian Islands, Southwest deserts, Arctic sea ice and shallow-water coral reefs around the globe.

"Climate change is no longer a distant threat on the horizon," said Leda Huta, executive director of the Washington group. "It has arrived and is threatening ecosystems that we all depend upon, and our endangered species are particularly vulnerable."

In the report, "It's Getting Hot Out There," the coalition ranks the top 10 "hot spots" for vulnerable species, mostly within the United States with a few beyond. No. 1 on the list: the Arctic ice sheets where polar bears, seals, walruses and sea ducks make their home. Tropical coral reefs were second. The delta is No. 5 and the Sierra Nevada No. 6 on the list.