The graph labeled (1. Aggregate emissions, 2. Energy consumption, 3. Population, 4. Vehicle miles traveled) shows that the pollution control methods are having a positive effect in the United States. The proof is (1. A decreasing, 2. An increasing, 3. An unchanging) trend in this graph, with the percentage drop over this period reaching (1. -63, 2. 0, 3. 17, 4. 147) %.