Of course, as anyone who has a bit of scientific knowledge knows, it isn't a myth. It is an effect on top of the natural climate change caused by raising the CO2 content by 50%, mostly in the last 50 years. This causes a very quick warming at a speed far quicker than natural climate change. It is this speed which makes the climate change so dangerous. Which is where we are back at the asteroids. Beyond the direct impact damage, they cause a sudden climate shift.