'habitable earth' is a correct and usable phrase in written English.
You can use it to refer to the planet Earth, and all the living conditions that allow it to support human life. For example: "We must work together to protect and preserve habitable earth for future generations."
There are only two pockets of habitable earth remaining and those are in Great Britain and Australia.
Thomas Burnet, for example, in his On the Increase of the Habitable Earth, seemed to imply that species could simply originate from unformed matter in the earth.
"If we continue to extract it unremittingly, there's no doubt that we are not going to be able to stay within any plausible envelope of a habitable Earth".
In fact, that carriage house was the most spacious, affordable and habitable New York home in which any of us had ever lived.
Although it is well within the solar system's Goldilocks zone, that band of space round the sun where conditions for planets were thought to be "not too cold and not too hot" to prevent a world from becoming habitable, Venus is nevertheless utterly lacking in water.
Finding evidence for any of these phenomena in Tissint tells scientists something about how habitable Mars might have been in the past.
Not only is it the fourth-largest country in the world, but two-thirds of it is habitable, unlike Russia or Canada.
Based on what we know about Europa today, we have good reason to believe that it is habitable – by Earth based standards – for life as we know it," says Kevin Hand, an astrobiologist at Nasa's Jet Propulsion Laboratory in Pasadena, California.
When I read last month that NASA's Kepler space telescope was allowing scientists to spy on a potentially habitable planet 600 light years away and compare it to Earth (it's 72 degrees, 290 days to its year), I thought of one person: atheist and Elmer's glue eater Jeff Malone.
As for planets, I no longer expect to see boots on Mars before I die, but I do expect to know where there is a habitable, really Earthlike planet or planets, thanks to Kepler and the missions that are to succeed it.
Overall, China has less habitable space than America but four times as many people.
