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In the us, for example, 627 billion gallons of water, the use of 38 million rooms, and 734 billion kilowatt-hours of electricity would have been saved in 2005 alone if no-one had got divorced.

Meanwhile, more than half a million pipes burst every year, according to the American Water Works Association, and more than 6 billion gallons of water are lost to leaky pipes.

Within the next six years new desalination plants may add as much as 13 billion gallons a day to the global water supply, the equivalent of another Colorado River.

We use about 410 billion gallons per day for the nation as a whole.

WaterSense program helped consumers save more than 36 billion gallons of.

After decades of lawsuits, in 1967 the Supreme Court capped Illinois's diversion at 2.1 billion gallons (8 billion litres) of water each day.

The FAA says that by 2018, as NextGen is rolled out around the U.S., the new system will reduce flight delays 35% to 40% and save almost a billion gallons of fuel.

The ethanol mandate is set at nine billion gallons for 2008 and is scheduled to rise to 36 billion gallons a year by 2022.

Simply improving the mileage of the U.S. fleet by one mile per gallon would save 6.1 billion gallons of gas per year, or $17 billion at today's prices.

The new project, dreamed up around a decade ago, would tap excess water from the White river when it floods and pump it, at the rate of about one billion gallons a day, to storage tanks on around1,000 rice farms.

To keep your car purring, you have to change the oil. Such maintenance produces eight billion gallons of used motor oil annually.

The United States used approximately 270 billion gallons of water per day in 1960.