Legendary climate scientist is not impressed with the Paris talks "There is no action, just promises," says James Hansen.

Global leaders may be on the brink of approving a historic climate change agreement in Paris, but James Hansen, a former NASA scientist and pioneer of climate science, says it won’t matter.

Hansen told The Guardian that, absent a commitment to tax greenhouse gases, any accord is just a vehicle for empty promises.

“It’s a fraud really, a fake,” Hansen said. “It’s just bullshit for them to say: 'We'll have a [2 degrees Celsius] warming target and then try to do a little better every five years.’ It’s just worthless words. There is no action, just promises. As long as fossil fuels appear to be the cheapest fuels out there, they will be continued to be burned.”