Question

each year, humans release a large amount of greenhouse gases into the atmosphere. in 2012, about 9.5 gigatons of greenhouse gases were released. one gigaton is equal to one billion metric tons, or about the mass of one billion small passenger cars.
the circle graph shows global greenhouse gas emissions, or greenhouse gases released, in 2012. each section shows the percent by weight that a particular greenhouse gas contributed to total emissions that year. the graph does not include water vapor.
global greenhouse gas emissions by gas
complete the sentence.
based on the graph, carbon dioxide emissions account for about ___ emissions as all other greenhouse gases combined.
half as much as much
two times as much three times as much

Explanation:

Step1: Calculate the percentage of non - carbon dioxide emissions

The sum of the percentages of non - carbon dioxide gases (methane, nitrous oxide, and F - gases) is \(16\%+6\% + 2\%=24\%\).

Step2: Compare carbon dioxide emissions with non - carbon dioxide emissions

Carbon dioxide emissions are \(76\%\). Let's check the ratio. If we assume the amount of non - carbon dioxide emissions is \(x = 24\) and carbon dioxide emissions is \(y=76\). We can also think in terms of simple proportion. If we consider the relationship between \(76\) and \(24\). \(76\approx3\times24\) (since \(3\times24 = 72\)).

Answer:

three times as much