In this wired age, with access to computers and smart phones by the millions, no one should claim to not be able to get the facts and to understand global warming. Sifting through the vast clutter of climate denier and climate deception web sites bought and paid for by those whose wealth comes from fossil fuel and related industries, still the average citizen could get some idea of the issue and make an informed decision. Yet politicians, most visibly, hem and haw around the subject, double-talk, and plant the seeds of doubt. I am sure even they DO understand, they just can't face how their comfortable (profitable) world would change if we actually did something about it. The net result is that we (humans) worldwide have largely not reacted. Read more here.