• Large filter presses help separate the solid and liquid waste streams. The solid "filter cake" goes to the solid fuel boiler to produce steam. The "filtrate" goes to the anaerobic digester to produce methane.

    Turning Point for a 'Fantasy' Fuel?

    Cellulosic Ethanol Gets Big U.S. Test

    More »

Personal Energy Meter

See how you measure up against others, and how choices you make at home and in the way you travel could help to protect the atmosphere.

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Did You Know?

Fourteen nations and Europe account for about 80 percent of world greenhouse gas emissions. See four ways to look at global carbon footprints.

More About Energy

  1. Photo: Aerial view of a city at night

    What Is the Great Energy Challenge?

    The Great Energy Challenge is a National Geographic initiative to help you understand our current energy situation. Explore the GEC to figure out and trim your carbon footprint.

  2. An interactive map shows four ways to look at carbon emissions around the world.

    Global Greenhouse Gas Footprints

    See how the world's biggest economies stack up on emissions with an interactive map.

  3. The changing Arctic: interactive map from National Geographic

    Interactive Map: The Changing Arctic

    See the shrinking sea ice, increased shipping, and energy exploration sites that are part of an evolving picture of the Arctic.

  4. Screenshot from an interactive bubble map of fossil-fuel subsidies worldwide

    Global Fossil-Fuel Subsidies Map

    See which countries pay the most for tax breaks and other mechanisms that keep fossil-fuel prices down.

  5. An incandescent light bulb.

    Light Bulb Savings Calculator

    How much could you save yourself, and the world, by switching to more efficient bulbs? Use this tool to find out.

  6. World Electricity Mix interactive map

    The Global Electricity Mix

    An interactive view of how regions and countries around the world generate their power.

  7. A sugar palm energy researcher.

    Great Energy Challenge Grantees

    Learn more about the energy-saving projects being funded as part of National Geographic's Great Energy Challenge program.

The Big Energy Question

What innovation should shape transportation in the future?

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@NatGeoGreen on Twitter

Working Toward Smarter Cities

  1. panamacity.jpg

    How to Make Cities Sustainable?

    From better mass transit to a stronger mix of renewable energy, what is the most important thing we can do to make cities smarter when it comes to energy use?

  2. Istanbul skyline with rush hour traffic in the foreground

    Powering Our Urban Future: Spotlight on Turkey

    Istanbul, the only city in the world that spans two continents, is a perfect setting for a close look at the energy and sustainability challenges of our increasingly urban planet.

See more »

Special Report: Shale Gas Rush

  1. The Hallowich family  Stephanie, Chris,  Children--Alie and Nate

    A Dream Dashed by the Rush on Gas

    The shale gas industry maintains that it protects drinking water and land. But mistrust has been sown in rural communities.

  2. Lee Zavislak learns to drive an 18-wheel truck at the Western Area Career and Technology Center in Canonsburg, Pennsylvania.

    New Jobs Through Energy

    The industry promises jobs to a state badly in need of an economic boost, but the work so far isn't where you might expect it to be.

  3. shale-map_503x465.jpg

    Mapping a Gas Boom

    Track the growing mark that energy companies have etched on Pennsylvania since first producing natural gas from shale.

View Our Complete Shale Gas Coverage »