1. Plants

    Scientists Say: Invasive species

    These are foreign species that are causing problems for native organisms and ecosystems.

  2. Climate

    Analyze This: Climate change could make food less healthy

    Levels of important nutrients are lower in crops exposed to high levels of carbon dioxide, a greenhouse gas. How high? Try levels expected to be typical 30 years from now.

  3. Plants

    Venus flytraps tend not to eat their pollinators

    A first-ever study of what pollinates a Venus flytrap finds little overlap between the critters that serve as pollinators and those that are prey.

  4. Plants

    Blooms on ‘chocolate’ tree are crazy-hard to pollinate

    The cacao trees must be pollinated or those seeds that give us chocolate will never form. The rub: The trees’ flowers challenge all but some of the tiniest pollen-moving insects.

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    Increasingly, chocolate-makers turn to science

    Chocolate is delicious and may even have health benefits. To make sure there’s enough to go around, scientists are growing heartier cacao trees.

  6. Ecosystems

    Here’s why scientists have been fertilizing the Arctic

    For more than 30 years, scientists have been fertilizing small parcels of Arctic tundra. Here’s what happens when you push an ecosystem to the brink.

  7. Plants

    Explainer: The fertilizing power of N and P

    Two elements — nitrogen and phosphorus — help plants grow. When the soil doesn’t have them, farmers might add them in the form of fertilizer.

  8. Environment

    Tropics may now emit more carbon dioxide than they absorb

    Analyses of satellite images suggest that degraded forests now release more carbon than they store.

  9. Climate

    Thawing mosses tell a climate change tale

    Plants long entombed beneath Canadian ice are now emerging. They’re telling a story of warming unprecedented in the history of human civilization.

  10. Plants

    Earthworm invaders may be stressing out some maples

    Worms are great for soil when ecosystems have evolved with them. But in earthworm-free places, like parts of the U.S. Upper Midwest, they can cause problems for plants and animals.

  11. Plants

    Cool Job: Rethinking how plants hunt for water

    Studies probing the very beginnings of root development may have important implications for growing food in a world where the climate is changing.

  12. Chemistry

    Why onions make us cry

    Researchers add another piece to the molecular puzzle biochemists have tried to solve for decades — why onions can make our eyes tear up.