Since environmentalists first began to raise the alarm about greenhouse gases, oil companies have tended to react by circling their wagons.

ECONOMIST: How green is Browne?

Head teachers have told ASCL this can take up to two hours, whereas in the past many schools would have been able to raise the alarm about a pupil over the telephone.

BBC: Schools 'losing out' in shake up

In one editorial, Cleveland Clinic cardiologist Eric Topol , who was the first to raise the alarm about Vioxx three years ago, calls for a formal government investigation into how Merck (nyse: MRK - news - people ) and the U.S. Food and Drug Administration left Vioxx on the market for so long after concerns about its possible heart risks had been raised.

FORBES: Top Doctor Calls For Vioxx Investigation

This technique has allowed Graham to raise the alarm early and often about potentially dangerous drugs.

FORBES: Face Of The Year: David Graham

Recent studies raise renewed alarm about the threats to reefs.

CNN: Task force announces coral reef protections