The Democratic candidates both support a national cap on greenhouse gases, calling for emissions to be cut 80 percent by 2050. Both would have those who emit carbon dioxide pay for every ton of greenhouse gas released. Both would set a federal standard requiring that 25 percent of electricity in the United States come from renewable sources such as wind and solar energy by 2025. As one piece of their energy plans, Sens. Barack Obama and Hillary Rodham Clinton propose investing $150 billion over 10 years on advanced energy technologies. Their proposals also include:

BARACK OBAMA

* Investing $150 billion over 10 years to advance the next generation of biofuels and promote development of commercial-scale renewable energy.

* Improving energy efficiency 50 percent by 2030.

* Support for a 52 mpg fleetwide standard by 2026.

* Providing tax credits to help domestic auto plants retool to build new fuel-efficient cars in the United States.

* Strictly monitoring and regulating air and water pollution from industrial livestock operations.

* Phasing out incandescent light bulbs by 2014.

DETAILS ONLINE: barackobama.com/issues

HILLARY RODHAM CLINTON

* Providing tax incentives for families and businesses to install small-scale renewable energy such as rooftop solar panels.

* Creating a $50 billion energy fund, paid in part by oil companies to fund investments in alternative energy. Would finance a third of $150 billion investment in clean energy over 10 years.

* Cutting foreign oil imports by two-thirds from 2030 projected levels, a reduction of more than 10 million barrels per day.

* Support for increasing vehicle fuel efficiency to 40 mpg by 2020 and 55 mpg by 2030.

* Providing $20 billion to help U.S. automakers retool plants to meet the standards.

* Phasing out incandescent light bulbs, starting in 2012. By 2020, all light bulbs would be 300 percent more efficient.

DETAILS ONLINE: hillaryclinton.com/issues

JOHN MCCAIN

The Republican candidate has called for a reduction of greenhouse gases starting in 2012. He is also against subsidies for oil and ethanol, and promotes using market forces to achieve reliable and cleaner energy, though his campaign has yet to offer specifics on a number of issues. He also:

* Was the lead author of legislation to reduce greenhouse gases 65 percent by 2050.

* Supports increasing fuel efficiency, but no standard specified. Supports development of plug-in hybrid vehicles.

* Supports energy efficiency. No specifics.

* Opposed setting a standard in 2005 that 10 percent of electricity come from renewable energy, and opposed a 20 percent standard in 2002.

DETAILS ONLINE: johnmccain.com/issues

NORTH CAROLINA BY THE NUMBERS

301 miles - Length of coastline

10 million - Number of hogs

5 - Number of commercial nuclear reactors

72.6 million metric tons - Amount of carbon dioxide emitted by electricity industry

(CAMPAIGN WEB SITES, LEAGUE OF CONSERVATION VOTERS, N.C. DEPARTMENT OF AGRICULTURE, ENERGY INFORMATION ADMINISTRATION)

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