The competing demands of being accurate and being heard can be particularly hard on scientists. Quoting Stephan Schneider: On the one hand, as scientists we are ethically bound to the scientific method, in effect promising to tell the truth, the whole truth and nothing but, - which means that we must include all the doubts, the caveats, the ifs, ands and buts. On the other hand, we are not just scientists, but human beings as well. And like most people we'd like to see the world a better place... To do that we need to get some broad-based support, to capture the public's imagination. That, of course, means getting loads of media coverage. So we have to offer up scary scenarios, make simplified, dramatic statements, and make little mention of any doubts we may have.
Explains a lot of scary headlines these days.