That would mean a big jump in forests, to 20% of the land area.
ECONOMIST: Slow progress on a bold plan to return Wales to forest
The scientists say protecting just 7% of Africa's land area would help to save many species.
He says the ideal facility would have about one-fourth of the land area and perhaps one-third the workers.
To match that output using wind energy, you'd need a land area nearly the size of Rhode Island.
This is because urban regions amount to less than 1% of total land area, according to the study.
Sugarcane is grown on about 90% of the cultivated land area and accounts for 15% of export earnings.
Globally just 0.6% of the world's oceans have been protected, compared to almost 13% of our planet's land area.
Hostilities are confined to a few barrios that comprise less than 1% of the total land area of Mindanao.
Now, those temperatures cover about 10% of the land area, the study said.
In tiny Macau (with a land area of just 29sqkm), all residents live within a short driving distance from the casinos.
And the country has nearly 24% of its land area as protected areas, including national parks, conservation areas and wildlife reserves.
While New York initially paid farmers based on their land area, for example, the city now bases its payments on hydrological surveys.
Extreme droughts currently cover about 2% of the world's land area, and that is going to spread to about 10% by 2050.
BBC: Man with dead camel in desert. Image: Jim Loring/Tearfund
Around one-fifth of the world's land area lies within the permafrost zone.
It is not just that Okinawa, with 0.6% of Japan's land area, has long had to bear a disproportionate brunt of the American presence.
Qatar is smaller than the Bahamas in land area, has less than 300, 000 citizens, but boasts the highest per capita GDP in the world.
Police said in a statement that the teenager was believed to have been living in the bush land area for the whole nine weeks.
BBC: Sydney teenager Matthew Allen survives two months in bush
The vehicles featured in this attraction are the first generation of the technology WDI improved for the Disneyland Resort Cars Land area of Disney California Adventure.
Current estimates suggest that 43 % of the total land area in the Gambia is still covered by forests, 78 % of which are severely degraded.
With a total land area of 26 sq km, and a population of a little over 10, 000 people, it is one-tenth the size of Washington DC.
Since 1895, wrote Tim Worstall for Forbes, only the extraordinary droughts of the 1930s and 1950s have covered more land area than the current drought.
FORBES: Beneath a Parched Surface, the Great Midwest Drought of 2012 Doesn't Go Social
Globally, the report says, watershed payments have rehabilitated 117 million hectares of countryside, a land area about as big as the entire country of South Africa.
It has also leased a 12, 000-acre land area to Chinese developers for a zone in Gwadar Port in Baluchistan Province, near the entrance to the Gulf of Oman.
Mulva lamented that although this land area is larger than any of the world's countries besides Russia and Canada, only 3% of it has been leased for energy development.
Huge inter-connected cylinders, each encompassing a land area as large as 100 square miles, would accommodate, in addition to extensive mining operations, capacious living quarters, gardens, and recreation areas.
Just by math, in a stochastic system with a stable mean, a land area of this size somewhere should have a 100-year high month about five times a year!
In 1950, at the beginning of the post-World War II suburban boom, the city of Raleigh had a population of 66, 000, living in a land area of only 11 square miles.
Having looked at all the information, they calculated that "6.8% of the UK's land area is now classified as urban" (a definition that includes rural development and roads, by the way).
Large areas of Africa receive little rainfall for much of the year, so even though Africa covers 20% of the world's land area, it only has 9% of global freshwater resources.
Terai accounts for about a fifth of Nepal's land area but is home to slightly more than half of its population, with the two ethnic groups making up just over a quarter of this.
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