New York City officials have promised to transform Willets Point into the city's "first green neighborhood," but the area could face a dire future as climate change raises the area's risks of flooding.

SAN FRANCISCO -- Global warming has brought hotter summer nights, less snow and fewer freezing days to the Lake Tahoe ecosystem in northern California and Nevada, according to an annual report out this week on the state of the lake.

Rising seas and stronger storms could wash water across portions of New York City, battering away at bridges and flooding subway tunnels as climate change mounts increasing threats to the low-lying city of 8 million people.

SAN FRANCISCO -- California's greenhouse gas emissions registry issued new rules this week meant to facilitate urban tree planting to generate carbon offsets.

Democratic aides in the House Energy and Commerce Committee are at work this month writing a major global warming bill aimed at achieving a 60 to 80 percent reduction by midcentury of heat-trapping greenhouse gas emissions.

New York state jumped into the growing fight against climate change this week by approving rules that will make electricity plants pay for each ton of carbon dioxide they release into the atmosphere.

Americans still think global warming is the biggest environmental problem facing the world -- but not as much as they did a year ago, according to a poll released this weekend from ABC News, Planet Green and Stanford University.