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Ahead of his virtual climate summit, Biden pressured by activists to act swiftly

Climate activists rallied in New York's Union Square on Monday with a message for the Biden administration: Time is running out, but it is not too late.

Along with demands to end fossil fuel reliance, activist leaders unveiled an addition to the digital «climate clock» displayed on a building above the square since September.

Obama says climate one of 'key challenges' of our time

President Barack Obama framed climate change as the toughest and most pressing challenge of our time on August 3, as he unveiled the first ever limits on US power plant emissions.

"No challenge poses a greater threat to our future and future generations than a change in climate," Obama said, warning: "There is such a thing as being too late."