the earth the greenhouse gasses

How is the Earth being compromised by greenhouse gasses and pollutants? How are these two changing the Earth? Be specific with some examples.

Do you believe that U.S. legislation over the the last 50 years has helped alleviate pollution issues? What could have been done better nationwide to alleviate more pollution? Think about the way Americans travel (e.g. cars).

In you opinion, what else can be done worldwide to lessen greenhouse gas emissions? Is the Earths fate questionable because the problem is irreversible? Be specific and creative with your answers.

These are the order of the questions that need to be answered.