And if their crops fail — because of drought or plant diseases, which also respond to a changing climate — they may be forced to move to the city. (scientificamerican.com)
Guliya is thought to be the best record of midlatitude climate during the last ice age, and its ice may well turn out to be a Rosetta Stone for interpreting how Asia responds to a changing climate. (science.sciencemag.org)
Volcanoes are generally thought to be imperturbable outside drivers of climate; I don't know of any possible feedback that could make volcanic emissions respond to changing climate. (realclimate.org)