Question

If gases like carbon dioxide and methane make up less than 1 percent of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

Answer 1

Answer: Even though there are smalll amounts of these gases, they can have a major effect on Earth. For example, increased amounts of carbon dioxide are having a major effect on global warming. :)

Answer 2

Answer:

Even though these gases are in small amounts, they can also have a major effect on Earth. An example is: "increased amounts of carbon dioxide are having a major effect on global warming."

Explanation:

(Somewhat the same answer as the other person, just worded different and gives a different meaning. :p)