As Earth approaches warmer levels experienced earlier in its geologic history, it may be bad news for human survival.
The cloud cover isn't what it used to be, and scientists say it is helping fuel Earth's hottest temperatures on record.
At the very beginning of its history, Earth was dry. How did it become a blue planet? A new theory could provide an answer.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback