The relation between our recent cold weather spells and global warming involves complex phenomena, the Gulf Stream current among them. For the more eager :
To better understand our irrealists expectations regarding science, conditioned by our “I-want-it-now!” culture: The Problem with Science: from Action Movies to the Real World!
For a innovative use of our fossil resources to mitigate the climate change, see une solution au casse-tête arctique.
For a more higher level paper, about the Gulf Stream, see this abstract of a paper published in 2015 by Jaime B. Palter, from the Department of Atmospheric and Oceanic Sciences of McGill University: The Role of the Gulf Stream in European Climate (Annual Review of Marine Science Vol. 7: 113-137)
The real demonstration will be given by the planet, as soon as the last ice and land glaciers will have melted.