"Before the 21st century, the struggle over limited and threatened water resources could sunder already fragile ties among regional states and leaded to unprecedented upheaval within the area."

In 1928-1932 alone at least ten million peasants migrated to the cities, causing "an unprecedented demographic upheaval".

The world is entering a time of unprecedented upheaval - environmental, social, political, economic.

In its magnitude and extent, it was an unprecedented popular upheaval, the likes of which has not been seen in Kerala before or since.

From the goliaths of industry to the smallest of niche firms, American companies seem to be in the grip of unprecedented industrial upheaval.

The stormy trail to yesterday's tentative settlement has occurred during unprecedented upheaval at Coke.

Mr. Andersen is working on a show focusing on the year 1848, "a time of unprecedented technical, social and political upheaval," he said.

Through some unprecedented volcanic upheaval, a portion of the ocean floor must have been thrown to the surface, exposing regions which for innumerable millions of years had lain hidden under unfathomable watery depths.

(EL) Mr President, ladies and gentlemen, over the past few days, we have experienced an unprecedented upheaval in our lives.

We need to realise that the disappearance of bees would amount to an unprecedented upheaval in the history of mankind.