Greenhouse gas emissions have "changed our planet to the very poles," researchers say in announcing the milestone reading.

Clinton sees climate change as a major threat, but she still wants to boost fossil fuel supplies.

The Australian prime minister recently repealed his country's carbon tax, but new data shows that it succeeded in reducing carbon emissions.

We’re closer to environmental disaster than ever before. We need a new story for our relationship with the Earth, one that goes beyond science and religion.

To avoid catastrophe, we must seize corporate polluters’ wealth. And to do that, we must change everything.

1.2% of the GDP. That's all it would take to green the economy.