A more potent greenhouse gas than CO2, methane emissions will leap as Earth warms

While carbon dioxide is typically painted as the bad boy of greenhouse gases, methane is roughly 30 times more potent as a heat-trapping gas.

Volcanoes trigger greenhouse effect

Earth's repeated flip-flopping between greenhouse and icehouse states over the past 500 million years may have been caused by volcanoes at particular spots where enormous amounts of carbon dioxide are released into the atmosphere.

GreenPeace criticizes iPad's large carbon footprint

GreenPeace has expressed its concern over the iPad's rather potentially large carbon footprint.