This unprecedented catastrophe shocked the Empire profoundly.

Chen said in his inaugural address in May 2000 that "our people experienced an unprecedented catastrophe last year, and the wounds are yet to be healed.

The oil-well fires that continue to burn in Kuwait threaten - if they have not already produced - an unprecedented environmental catastrophe.

So that was Earth in the summer of 2128: an unprecedented catastrophe, an ongoing universal crisis.

But if a big impact happens, it would be an unprecedented human catastrophe.

If"you happen to have been Chinese, working at the naval base, you have faced catastrophe probably unprecedented in your lifetime.

This is an unprecedented environmental catastrophe.

"This is an unprecedented global catastrophe," he added, "and it requires an unprecedented global response."

Mr President, Commissioner, we are faced with an unprecedented human catastrophe.

As is the prospect of a countdown to unprecedented catastrophe for further generations if the present unacceptable situation continues.