Humans evolved to live on an icy planet. Earth is usually much hotter.
As Earth approaches warmer levels experienced earlier in its geologic history, it may be bad news for human survival.
Evolving intelligent life took billions of years—but it may not have been as unlikely as many scientists predicted
A popular model of evolution concludes that it was incredibly unlikely for humanity to evolve on Earth, and that extraterrestrial intelligence is vanishingly rare.
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Science KS1/KS2: Timeline of life on Earth
Dr Neil Clark, a real life palaeontologist ... From 4.6 billion years ago when the Earth was red hot, the timeline illustrates the evolution of the first life forms through to plants ...