Test ministeriali 2012-2013 in lingua inglese per l’accesso alla facoltà di Medicina e Chirurgia 2012-2013
After Northern Europe experienced the coldest weather for several years last winter, people are claiming that the theories of global warming are incorrect. This is not a conclusion that can be drawn from the information as it is only based on a single year's data. Global warming is based on long term changes in average temperature. It therefore does not mean that the temperature will increase every year. The extreme weather last winter was caused by cold air from the Arctic which is normally kept there by strong winds around the pole. Last winter those winds were not as strong. Which one of the following, if true, would most strengthen the above argument?