Emissions of heat-trapping carbon dioxide (CO2) reached an all-time high of 36.9 gigatons in 2014, a 2.5% increase over 2013. The International En­ergy Agency said this further reduces the chance that the world could avoid a dangerous rise in global average temperature by 2020. (a) If the discharge of CO2 continues at the same 2.5% rate per year for the next 6 years, how many gigatons will be released in 2020, and (b) what will be the total percentage increase between 2014 and 2020?

What will be an ideal response?


(a) CO2 discharge = 36.9(1 + 0.025)?
= 42.79 gigatons (4.279 × 10¹? tons)

(b) Total % increase = [(42.79 – 36.9)/36.9](100)
= 15.96%

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