Since 1971, average consumption per person has doubled; at the same time, relative price has nearly halved.

The United states trend in coal use has been rising from 1950 through 2007, when coal production and consumption more than doubled.

The industry's consumption of 2.8 trillion cubic feet annually could double in the next decade.

But in the past few decades, garlic consumption has doubled, with every red-blooded American eating an average of two pounds a year.

Chinese consumption, for instance, more than doubled between 1995 and 2005.

Moreover, the 1968 per capita consumption of all wine - 1.07 gallons - has since more than doubled.

And yet consumption has doubled since then.

The consumption of natural gas has nearly doubled in the last 30 years.

Nitrogen fertilizers whose consumption has doubled between 1980 and 1993 present another source of pollution.

The consumption of sweet soda and fruit drinks has more than doubled since the 1970s.