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World estimates of the amount of ice in permafrost vary from 200,000 to 500,000 cubic kilometres (49,000 to 122,000 cubic miles), or less than 1 percent of the total volume of the Earth.
Even with the best will in the world, estimates can be wildly off the mark.
Such surveys, country by country, have led the United Nations AIDS program, Unaids, to slowly scale back its world estimates.
While South Africa undisputedly has the highest rates of rape in the world, estimates on the number of assaults each day vary greatly.
A new report on creating a sustainable "cold chain" in the developing world estimates that about 25-50% of food wastage (PDF) could be eliminated with better, more climate friendly refrigeration.
Sue Bray, the executive director of the Good Sam Club, which has one million member families and claims to be the largest R.V. club in the world, estimates that 70,000 of the club's member's are full-timers.
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South Africa has the largest population of rhinos in the world, estimated at 19,000.
The earthquake brought pledges of support from around the world, estimated at more than thirteen billion dollars.
Zimbabwe has one of the highest unemployment rates in the world, estimated at more than 90%.
Egypt has the largest standing military in the Arab world, estimated at 450,000 troops.
The E.P.A.'s "real world" estimate is 82 miles in combined city and highway driving.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com