This all goes back to a theory being falsifiable:
When both warmer winters and colder winters prove the same thing and when the theory is regarded as "settled science" just as much when its predictions are refuted as when they are confirmed, then you know we are not dealing with real science.
The difference between real, hard science and non-science is that real science consists of theories and laws that can be empirically verified. Here is how: a truly scientific assertion generates predictions which can be compared to actual data collected after the prediction and which can be used to confirm or falsify the prediction.
The Global Warming Alarmists claim that AGW (anthopogenic global warming) is scientifically "proven." But the predictions made on the basis of the theory have not come true, so in an a version of the old shell game the shift is being made from "Global Warming" to "Climate Change," which is, when you think carefully about it, not falsifiable. As long as the climate changes, "Climate Change" is proven. How can that not happen? Global Warming has been dropped like a hot potato because it is too precise and can be refuted by facts, so "Climate Change" suits the purpose much better.