The broader question when considering habitability is, "habitable by whom?" The concept of habitable zones around stars is slavishly tied to the old "Star Trek" definition of "life as we know it".
The Senkakus' habitability is legally significant as "rocks which cannot sustain human habitation or economic life of their own" would not be in the 200-mile exclusive economic zone (EEZ) prescribed by the UN Convention on the Law of the Sea.
If any Martians did live there, they probably bore a passing resemblance to Earth-bound critters called chemolithoautotrophs: hardy, single-celled organisms that make use of chemical energy rather than sunlight and which are able to create complicated biological molecules from elemental ingredients.Evidence of habitability is not, of course, the same as evidence of habitation.
The speed of climate change may also help, reckons Paul Romer of New York University, if broader shifts in habitability occur slowly enough to allow a relatively smooth geographic adjustment.
Mankind faces "a planetary emergency", he said; "a crisis that threatens the survival of our civilisation and the habitability of the Earth".He proposed a series of measures that might ward off the environmental apocalypse.
But change may be too quick and unpredictable to allow for easy adaptation.Provided that broad changes in habitability occur relatively slowly, America's economic geography should be able to adjust, at least in theory.
These are countries where large portions of the population are still subsistence farmers, where simple habitability is already on a knife's edge, even at incomes and levels of water use a tiny fraction of those in developed countries, and where populations are growing at 2.5% a year or more.
The originality and habitability of these projects, reinforced by antipollution measures protecting the river, generated new enthusiasm for long-ignored areas.
He wrote a history of the Numantine War, evidently after 133 bce, and also a treatise on the habitability of the equatorial region; but when he composed the latter is unknown.
In the latter weeks of May, as the Mississippi River crested at record levels in many areas and then began to slowly recede, state officials began the process of evaluating evacuated properties for habitability.
In it were combined the seagoing hull, armour, and habitability of the Virginia, Gloire, and Warrior with the revolving turret and big guns of the Monitor.
