সঠিক উত্তর হচ্ছে: যুক্তরাষ্ট্র
ব্যাখ্যা: China is the world\'s largest contributing country to CO2 emissions—a trend that has steadily risen over the years—now producing 10.06 billion metric tons of CO2. But USA CO2/population (tCO2/capita) is greater than China. [Source: International Energy Agency]