i hear its around the same amount as a car!
A new, full 737 will get about 100 mpg per person. A lot of planes flying now though are older and use up to 30% more fuel than that.
Some animals produce different amounts of carbon dioxide. insects, use 6 billion metric tons. humans, use only about 2 million metric tons. I bet another animal has 4 million metric tons, and another...
They use jet fuel which creates carbon dioxide and other pollutants. Man produces between 3 and 6% of all CO2 produced. Planes make up a very very small portion of the total CO2 we produce.