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But he added there was plenty of research showing Facebook had positive effects on its users.

France has some of the most plentiful reserves of shale[頁岩] gas in Europe, but there are objections to shale exploration on environmental grounds.

“We are united in our desire to promote sustained and balanced global economic growth,” India’s prime minister, Manmohan Singh, said during the meeting’s plenary session[大會]. New York Times (Mar 30, 2012)

“People say swimming is solitary, but my experience is so opposite,” Ms. Jeanette said.

“All of the natural resources have been severely degraded and depleted.”

The United States loses topsoil[表土] 10 percent faster than it can replenish; China and India are at rates of 30 to 40 times faster. Scientific American (Apr 6, 2013)

"That means the economy is replete with distortions and as inflation picks up, they get worse."

Some local authorities have already implemented large reductions to arts budgets, with profound effects on museums and libraries also.

They can be learned by sufficiently intensive practice. Scientific American (Jul 30, 2013)

The study did not look at fish oil supplements, but experts say these may also be beneficial.

There is a supplementary water supply in case the rain supply fails.

A demonstration model would take up to four years to complete, he said.

Two discussions from different points of view may complement each other.