Excerpt from: http://www.msn.com/en-ca/weather/topstories/its-frickin-cold-out-the-link-between-extreme-weather-and-climate-change/ar-BBT1291?ocid=iehp

“Polar vortexes have always been around but their breakdowns in the northern hemisphere — which send cold south — are getting more frequent. Scientists don’t yet share a consensus as to why; some point to climate change as the cause. What we do know is that polar vortex breakdowns are contributing to shorter and more intense winters.”

The cause (in my opinion) is very simple; “extra energy” is causing the atmospheric molecules to escape into space; the consequence is that loosing atmospheric pressure causes the environmental changes.
In “very extreme case”; the Earth might lose most of its atmosphere then the weather could mimic that of the moon, where there is very cold and very hot areas depending on the sun shine.
I fully understand the conjecture that the “extra” energy is a result from the “retention” of sun’s energy due to the “greenhouse gasses” and I am not disputing that view, I am only pointing out that there is also “EXTRA” energy being converted from the potential energy of mass into kinetic energy that “heats” the surroundings, and my point is that “IF” that energy is very great, then it adds to the problem.
Since I do not know the exact amount of “extra” energy that the nuclear experiments have created and how much of it has accumulated or how much of it has radiated into space, I am left to speculation about the consequences caused by laws of nature.