Soot plays an important role in climate change , but is still the leading cause of earths changing climate. a) acid rain b) nitrous oxide c) carbon monoxide d) carbon dioxide

The answer for the above question is carbon dioxide.
Climate change is caused by various factors which includes greenhouse effect and global warming. Green house gases are responsible for warming, and humans emit them in a variety of ways. The most common being from the combustion of fuels in cars, factories and electricity production. The gas responsible for the most global warming is carbon dioxide, other contributors include methane, nitrous oxide from fertilizers among others

Sugar + oxygen > carbon  dioxide + water + energy  c6h1206 + 6o2 > 6co2 +6h2o + energy  and the numbers after the element symbols are small.