COP21

As global leaders hailed the climate agreement as a historic step forward, some activists were less optimistic.
The President should remember that the historic agreement "is subject to being shredded in 13 months," McConnell said.
"We've shown what's possible when the world stands as one."
The accord shows humans can transcend narrow national interests.
The accord "saves the chance of saving the planet," says one advocate.
"There is no action, just promises," says James Hansen.
Science shows that sleep deprivation can ruin your decision-making.