Re: Norway
"The panic is based on a long held belief of the British, other Europeans, Americans and, indeed, much of the world's population that the northward heat transport by the Gulf Stream is the reason why western Europe enjoys a mild climate, much milder than, say, that of eastern North America."
And yet....
"The Gulf Stream carries the warm, poleward return flow of the wind-driven North Atlantic subtropical gyre and the Atlantic Meridional Overturning Circulation. This northward flow drives a significant meridional heat transport. Various lines of evidence suggest that Gulf Stream heat transport profoundly influences the climate of the entire Northern Hemisphere and, thus, Europe's climate on timescales of decades and longer." (https://www.annualreviews.org/doi/10.1146/annurev-marine-010814-015656) This is from 2015.
What you are missing is that no part of the climate acts entirely independently from any other part. The paper quoted above concludes with this summary :
"However, there are situations in which the Gulf Stream's influence on Europe's climate may not live up to expectations. First, on timescales shorter than roughly a decade, variability in the atmosphere seems to swamp any oceanic signal in setting basin-scale climate patterns. Second, Europe's warmth relative to the zonal mean cannot be attributed simply to westerly winds extracting heat from the warm current. Stationary waves in the atmospheric midlatitude jet contribute to zonal anomalies of both signs, with the Rocky Mountains playing an important role in establishing the southwesterly winds that bring warm air masses to Europe. Thus, when the ocean heat transport is eliminated in model simulations, Europe's zonal temperature anomaly is not entirely erased, though it is diminished (Seager et al. 2002). In a fun twist, recent research has implicated the Gulf Stream even in setting up these stationary waves and contributing to the frigid winters on North America's east coast (Kaspi & Schneider 2011), against which Europe's warmth is often contrasted."
So no, it's not entirely the airflow over the Rockies, although that plays a part in the global climate. To dismiss everything else as a "panic" (and thus inconsequential) is foolish.