Alarmist

An alarmist is one who tries to alarm others, especially by using exaggerations.

In modern usage, such people can fall under the following categories:

• Some bloggers
• Global Warming alarmists
• Environmental alarmism
• Certain Left-Wing websites
• Certain Right-Wing websites
• Nationalist governments which seek to gain the blind trust of the populist by way of inventing threats to national security. See Nazi and 1984.
• Extremists
• Supporters of population control.

Alarmism within the environmentalism movement has been sustained since the 1970s, as noted by Lee Duigon:

Environmentalism can’t survive without a doomsday scenario. Forty years ago it was “the population bomb,” proclaimed by the infallibly wrong Paul Ehrlich. Soon afterward, it was an impending Ice Age. That has given way to Global Warming—which, in deference to harsh winters and less than torrid summers, is yielding place to the much more elastic boogeyman of Climate Change.