Although aviation is a relatively small industry, it has a disproportionately large impact on the climate system. It presently accounts for 4-9% of the total climate change impact of human activity.
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...
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.