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Fortune: A $3 trillion climate change battle

A climate-change bill that has widespread support as it heads to the Senate floor will create an estimated $150 billion of new assets in the first year it takes effect. Between now and 2050, regulating greenhouse gases could easily generate $3 trillion worth in value in the United States.

Polar bear now listed as 'threatened' species

Polar bears will now be listed as "threatened" under the Endangered Species Act.

Time.com: Polar Bears: Protected, but Not Safe

Analysis: The US finally rules that global warming is indeed threatening the species' survival. Not that it will make any difference

Time.com: US: Polar Bear a Threatened Species

(WASHINGTON) -- The Interior Department declared the polar bear a threatened species Wednesday, saying it must be protected because of the decline in Arctic sea ice from global warming.Interior Secretary Dirk Kempthorne cited dramatic declines in sea ice over the last three decades and projections of continued losses. These declines, he told a news conference, mean the polar bear is a species likely to be in danger of extinction in the near future.Kempthorne also said, though, that it would be "inappropriate" to use the protection of the bear to reduce greenhouse gases, or to broadly address climate change.Reflecting views recently expressed by President Bush, Kempthorne said the Endangered Species Act was "never meant to regulate global climate change."He said the decision to list the bear includes administrative actions aimed at limiting the impact of the decision on energy development and other climate related activities."This listing will not stop global climate change or prevent any sea ice from melt

Time.com: McCain's Gift to the Green Movement

The GOP candidate's global warming plan has its flaws. But he has engaged the issue, and that bodes well for the '08 campaign

A timeline of climate change science

Climatology was once a small and often overlooked branch of science. But important discoveries made as early as the 19th century have contributed to what is the most important field of scientific study in the world today. Listed below are some key dates in climate change history.

McCain: Clean energy a 'national security issue'

Sen. John McCain took his weeklong environmental tour to Washington state Tuesday, addressing the need for reducing the nation's dependency on foreign oil and sparking investment in environmentally friendly technology.

Time.com: How Green Is John McCain?

The presumptive GOP nominee is a step up from Bush, but that still doesn't make him the environmental candidate

McCain appeals to independents with environment pitch

Kicking off a week-long push seen as outreach to independent and Democratic voters in crucial swing states, John McCain on Monday delivered a speech outlining his vision for combating global warming.

CNN Student News Learning Activity: Understanding earthquakes

Direct students to their textbooks and online resources to learn about what causes earthquakes and the scale used to measure an earthquake's magnitude. Then, organize students into small groups and assign each group one year between 1999 and 2008. Refer groups to print and online resources to learn more about the most significant earthquakes that took place in their assigned years. On a large map of the world, have students mark (with small circle stickers or markers) the locations of these earthquakes. Based on their observations, have students make hypotheses about why earthquakes occur where they do.

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