Ask questions to clarify evidence of the factors that have caused the rise in global temperatures over the past century.

  1. Environment

    Seeing red: North’s CO2 hits new peak

    CO2 values are now 50 percent higher than before the Industrial Revolution.

  2. Climate

    Arctic sends weird weather south

    Arctic warming is affecting weather farther south, where most of the world lives. The impacts are especially worrisome for agriculture.

  3. Environment

    China exports pollution alongside goods

    Many companies have moved the plants that make their products to developing countries, such as China. But the pollution linked to making those products can travel around the world.

  4. Chemistry

    Explainer: Ocean acidification

    Here’s why shellfish and other animals in the sea suffer when the ocean is forced to absorb too much carbon dioxide.

  5. Climate

    Watching our seas rise

    Satellites, coral reefs, ancient Roman fishponds and sinking cities help us understand how humans are changing sea level.

  6. Climate

    Did Columbus contribute to a Little Ice Age?

    Scientist shows a surprising link between the explorer and a dip in temperatures.

  7. Oceans

    Life beneath the ‘berg

    Scientists find Antarctic icebergs play a new and bigger role in the climate cycle.

  8. Climate

    A change in climate

    Global warming may be wiping out some plants and animals or pushing them into new habitats.