You are a scientist looking for the evidence that global
warming is really happening. Many are putting the blame for this on the increase in travel. More cars and the increase in the numbers of people travelling by plane. This has increased the rate at which fossils fuels are being burnt.
You
have average global temperature data for the last 40 years. There
seems to be some connection between the temperature on the planet
and the amount of at least one gas in the atmosphere. You
have the concentration measurements of this gas in the atmosphere
for the same time period.
This
gas is produced when fossil fuels are burnt.
