However, while questions of attribution come up whenever something weird happens to the weather, these papers demonstrate clearly that the instant pop - attributions we are always being asked for are just not very sensible. (realclimate.org)
This is the question of attribution: Are human activities primarily responsible for observed climate changes, or is it possible they result from some other cause, such as some natural forcing or simply spontaneous variability within the climate system? (scientificamerican.com)