Indian Institute of Foreign Trade 2010 Solved Paper

$\mathrm{CO}_2$ emission required for USA = 225 million tonnes$\mathrm{CO}_2$ emission required for China = 202.5 million tonnesRequired reduction for USA = 975 million tonnesRequired reduction for China = 977.5O.5 million tone of $\mathrm{CO}_2$ ----> 1.25 carbon creditsIn one year, a country can purchase 65 carbon creditIn one year, 26 million tonnes of $\mathrm{CO}_2$ is compensated.Required time $=\frac{977.5}{26}=37.59$ yearsHence, option B is the correct answer.