CO concentration parts per million 8 400 350 3 00 250 200 150 wwwm M 800 000 600 000 400 000 Years before present 200 000 2016

Question

CO concentration parts per million 8 400 350 3 00 250 200 150 wwwm M 800 000 600 000 400 000 Years before present 200 000 2016 1900 1800 I 18 Which of the following trends is observed in the data a A constant increase with a greater rate of increase starting around the year 1800 b A slight decrease with a sudden increase starting around the year 1800 c Consistent fluctuations between 200 and 300 ppm d Regular fluctuations between 200 300 ppm with a sudden increase to over 400 ppm since the year 1800 19 What conclusion would make the most sense based on this data a Humans were not collecting CO data thousands of years ago so these data are likely false b Historic ice core CO levels are constantly changing so no general patterns can be identified c CO concentrations in the last 200 years are significantly different from levels in the past d The CO levels in the atmosphere have varied in the past so changes today are also explained by natural processes Que C

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