> One thousand years ago there were farms in Greenland. Just two hundred years ago there was Little Ace Age and river Thames would freeze every winter. One fai

> One thousand years ago there were farms in Greenland. Just two hundred years ago there was Little Ace Age and river Thames would freeze every winter. One fairly well-supported theory of the cause of the Little Ice Age is that reforestation that due to a decline in Eurasian and American human populations led to an uptake in CO2 absorption [1] [2]. This suggests that at least partially anthropogenic climate change is a phenomenon which existed even before the Industrial Revolution. In any case, > Single vulcano explosion releases more CO2 than entire mankind in a decade. No [3]. Moreover, volcanic eruptions tend to have an overall dimming effect due to their release of sulfur-containing compounds which form sulfuric acid aerosol. There have even been some radical/crackpot geoengineering proposals to release sulfur into the atmosphere to combat global warming [4]. 1: http://journals.ametsoc.org/doi/full/10.1175/EI157.1 http://journals.ametsoc.org/doi/full/10.1175/EI157.1 2: http://hol.sagepub.com/content/early/2011/06/11/0959683611404578.abstract http://hol.sagepub.com/content/early/2011/06/11/095968361140... 3: http://www.skepticalscience.com/volcanoes-and-global-warming-intermediate.htm http://www.skepticalscience.com/volcanoes-and-global-warming... 4: http://en.wikipedia.org/wiki/Stratospheric_sulfate_aerosols_(geoengineering) http://en.wikipedia.org/wiki/Stratospheric_sulfate_aerosols_...