Sentences with phrase «per cent of time earth»

For less than 20 per cent of time Earth has had ice.

Not exact matches

More specifically, 17 per cent of the stars host a Jupiter - like planet, 52 per cent have a Neptune - like planet, and 62 per cent harbour a super-Earth — a rocky planet up to 10 times as massive as Earth.

Botany Professor Steven Higgins says they used their new classification scheme to examine change in biomes over time and found that 13 per cent of Earth's land surface changed its biome state over the last three decades.

According to the accepted view, the formation of the Earth released vast amounts of water vapour and carbon dioxide, which formed a thick atmosphere and caused strong greenhouse warming at a time when the Sun was 15 to 20 per cent fainter than today.

That would have raised lunar air pressure to about 1 per cent that of modern Earth, or 1.5 times as dense as the atmosphere on Mars today (Earth and Planetary Science Letters, doi.org/cdww).

Based on measurements of these taken over a full Martian year, the team concludes that about 4 billion years ago, the Red Planet's atmospheric pressure — currently less than 1 per cent of Earth's — was up to 1.5 times what Earth's is today.

But most importantly of all, and over the time scale that counts for testing the hypothesis of dangerous global warming, since 1998 the Earth has failed to warm at all despite an increase in atmospheric carbon dioxide of more than 5 per cent.

Paul Robinson, Executive Editor at The Earth Times says, «Around five per cent of the world's carbon emissions are now attributed to computing.