1. Earth

    Diesels: NO rises with altitude

    The combustion chemistry of heavy-duty diesel trucks changes with altitude.

  2. Earth

    Passive smoking’s carcinogenic traces

    Researchers isolated markers of a cigarette-generated carcinogen in urine of nonsmoking women married to smokers.

  3. Earth

    Satellites verify greenhouse-gas effects

    Comparisons of data obtained from instruments that orbited Earth more than 25 years apart provide direct evidence that the planet's greenhouse effect increased significantly between 1970 and 1997.

  4. Earth

    Is there a vent in the global greenhouse?

    Satellite observations of ocean temperatures in tropical regions of the western Pacific suggest that when ocean temperatures there warm up, the amount of heat-trapping cirrus clouds decreases, possibly providing a heat-venting effect that could help reduce global warming.

  5. Earth

    A Nation Aflame

    In the wake of one of the worst fire seasons in the past 50 years, scientists are assessing risk as more people move into fire-prone areas and developing ways to better predict the behavior of--and the potential for--wildfires.

  6. Earth

    Siberian snow has long-range effects

    The strength of the winter weather feature called the Siberian high is linked to the amount of early-season snow cover in its namesake region.

  7. Earth

    Lack of oxygen locks up peat’s carbon

    The inactivity of a single enzyme in peat due to the lack of oxygen may be the only thing preventing massive releases of carbon dioxide from the peatlands.

  8. Earth

    Antarctic glacier thins and speeds up

    One of the largest glaciers in Antarctica is growing thinner and retreating inland, spurring concerns that changes occurring along the coastline may be causing the ice stream to drain more material from the interior of the continent and send it out to sea, thus aggravating rising sea levels.

  9. Earth

    Seismic shivers tell of tornado touchdown

    Researchers say they can now use earthquake-detecting seismometers to detect and possibly track all but the weakest tornadoes.

  10. Earth

    Electricity-leaking office equipment

    Nearly 2 percent of U.S. electricity each year goes to power office equipment that had ostensibly been turned off.

  11. Earth

    Contaminants still lace some meats

    Tainted ingredients of livestock feed can contribute to worrisome residues of organochlorines, such as PCBs, ending up in meat.

  12. Earth

    Plastic debris picks up ocean toxics

    Some plastics can accumulate toxic pollutants from water, increasing the risk that they might poison wildlife mistaking these plastics for food.