CO2 emission required for USA = 225 million tonnes
CO2 emission required for China = 202.5 million tonnes
Required reduction for USA = 975 million tonnes
Required reduction for China = 977.5
O.5 million tone of
CO2 ----> 1.25 carbon credits
In one year, a country can purchase 65 carbon credit
In one year, 26 million tonnes of
CO2 is compensated.
Required time
==37.59 years
Hence, option B is the correct answer.