The analysis found that cyclists had 2.3 times more soot in their airway cells. (scientificamerican.com)
In the case of Arctic shipping, more traffic generates more soot, promoting further ice melt and inviting more traffic. (discovermagazine.com)
Based on these figures, I suppose that the West Greenland ice melting was larger in the 1930 - 1950 period than in the 1985 - 2005 period... Alternative explanations may be that the Greenland ice melting has nothing to do with temperature, but with more insolation (less clouds), less precipitation, more soot deposit,... (realclimate.org)