66.After reading the passage, we can infer that in Canada_____.
A.people always keep much physical distance between each other
B.people in Quebec like being informal in their language etiquette
C.pedestrians in small towns have to be very careful before they cross the street
D.people's concept of space has negatively affected the development of their cities
D
CLIMATE science is famously complicated, but one useful number to keep in mind is "climate sensitivity".This measures the amount of wanning that can eventually be expected to follow a doubling in the atmospheric concentration of CO2 (carbon dioxide).The Intergovernmental Panel on Climate Change(IPCC), in its most recent summary of the science behind its predictions, published in 2007, estimated that, in present conditions, a doubling of .CO2 would cause warming of about 3, with uncertainty of about a degree and a half in either direction.But it also says there is a small probability that the true number is much higher.Some recent studies have suggested that it could be as high as 10.
If that were true, disaster occurs.But a paper published in this week's Science, by Andreas Schmittner of Oregon State University, suggests it is not.In Dr Schmittner's analysis, the climate is less sensitive to CO2 than was feared.
Existing studies of climate sensitivity mostly rely on data gathered from weather stations, which go back to roughly 1850.Dr Schmittner takes a different approach.His data come from the peak of the most recent.ice age, between 19,000 and 23,000 years ago.His group is not the first to use such data (ice cores, fossils, marine sediments and the like) to explore the climate's sensitivity to CO2 But their paper is the most thorough.Previous attempts had considered only small regions of the globe.He has collected enough information to make an attempt at recreating the climate of the entire planet.
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