I'm not sure how you know that, given that none but the most doctor ozish of climate scientists (Hansen and ilk) will claim the doomsday scenarios are likely. Even then, other climate scientists will quickly repudiate such claims. As they have.

All fields have their attention whores and serial exaggerators. They are better ignored.

Or perhaps you are referring to the opinions of advocates or true believers? Those opinions, unfortunately, saturate the media.

As with any controversial science, a reading of the contrasting opinions of phds would do you far better.