As far back as 1995, articles in medical journals and the establishment of a Pennsylvania treatment center for overusers generated interest in the subject.

So large is the Pacific, covering 30% of the planet's surface, that the specific energy generated by its warming is enough to touch off a series of weather changes around the world.

But in the course of trying to do so, they generated a lot of ideas about the nature of the problems and about what potential solutions would look like.

The decline started in the 1950s, when manufacturing generated a sturdy 28% of the national income, or gross domestic product, and employed one-third of the workforce.

By last year, Wall Street traders, bankers and those who deal in real estate generated 21% of the national income, double their share in the 1950s

It generated just 12% of the gross national income.

The level of emissions they cause will depend on how the electricity to run them is generated, while brakes, tyres and toads all create tiny airborne particles as they wear out.

This generated little commerce for downtown businesses in the evenings, which made business and generating tax revenue for municipal upkeep difficult.

The bicycles will have smart phones attached to the handlebars measuring how much power is being generated for the hotel.

Today, scholars have generated large amounts of instructive research about restaurants.

In March, for the first time, wind and solar power accounted for more than 10 percent of the power generated in the US, reported the US Energy Information Administration.