There has been a definite, obviousimpact on the Earth’s climate by global warming. The unusual high frequency of heatwaves provesthat there has to be a human influence. As much of the USA burnsthrough another hotsummer and the Midwest suffers froma historic drought, NASA’s climateexpert Hansen states that the future he predicted in 1988 has finally arrived.Hansen and his colleagues have analyzed the frequency and scale of unusual temperature. On average, the Earth’s temperature has warmed by about0.5-0.6°C. Since then, the shift has impacted many parts of the world. Extremely hot summers, with a 3.5°C warmer temperature, have affected 10% of the world since 2006, which is muchhigher than the period of 1951to 1980.The possibilitythat these events would have occurred without global warming is very small. The study is purely statistical and doesn’t try to explain how climate changes have affected extremely hot summers. But it should help people understand global warming and the seriouseffect humans have on the climate system, states Kevin, a scientistat the US National Center for Atmospheric Research in Colorado.1.What did climate expert Hansen predict in 1988?A) Unusually high frequency of drought.B) Global warming’s influence on human.C) The unusual high scale of global warming.D) Frequency and scale of unusual weather events.2.What is the average temperature rise of the Earth since then?A) 3.5-4°C.B) 0.5-0.6°C. C) 0.5-1°C.D) 1.95-1.98°C.3.What should the study try to do?A) Help people avoid warmer summers.B) Help people understand global warming.C) Explain how climate changes lead to hot summers.D) Explain how the temperate shift has affected the world.