No climate model has predicted a complete shutdown during this century, though many suggest that a slowdown is possible.

ECONOMIST: The science

After three years poorly performing schools also run the risk of a complete shutdown, to be reopened later with a new staff.

CNN: Bush impatient with Congress on education bill

To be sure, a complete shutdown of its output would be difficult: the country has several export outlets and some redundancy in pipeline infrastructure.

ECONOMIST: The oil markets are jittery