1. Earth

    Researchers confirm sea change in oceans

    A new analysis of ancient seawater shows that the ocean's chemistry has fluctuated over the last half-billion years.

  2. Earth

    How polluted is a preschooler’s world?

    Preliminary data from a new study show that children may ingest traces of atrazine, a common herbicide, in their drinking water.

  3. Earth

    Kitchen tap may offer drugs and more

    Excreted drugs and household chemicals are making their way through community waste-treatment and drinking-water plants.

  4. Earth

    Composting cuts manure’s toxic legacy

    Composting manure reduces its testosterone and estrogen concentrations, limiting the runoff of these hormones, which can harm wildlife.

  5. Earth

    Photo Treasures

  6. Earth

    Lowland tree loss threatens cloud forests

    Changes in regional climate brought about by large-scale deforestation in the eastern lowlands of Central America are affecting weather in the mountains downwind, imperiling ecosystems there.

  7. Earth

    Ill Winds

    Research suggests that the long-range movement of dust can sicken wildlife, crops—even humans—a continent away.

  8. Earth

    Rain of foreign dust fuels red tides

    Soil particles from Africa, raining out from clouds over the Americas, may trigger the first steps that lead to toxic red-tide algal blooms off Florida.

  9. Earth

    EU moves against flame retardants

    The European Union has provisionally voted to ban the use and importation of nearly all members of a family of flame retardants known as polybrominated diphenyl ethers.

  10. Earth

    Where’s the smoke from the N.Y. fires?

    Analyses of smoke from the destroyed World Trade Center towers indicated little risk that the fires would cause significant health effects for cleanup crews and city residents.

  11. Earth

    Dust, the Thermostat

    Analyses suggest that dust has profound, complex, and far-reaching effects on the planet's climate.

  12. Earth

    Quantum physics explains core anomaly

    Scientists have used the principles of quantum physics to answer the long-standing puzzle of why seismic waves travel at different speeds in different directions across Earth's inner core.