Researchers have found that the aging of the U. S. population may help slow global warming. A demographer used a new computer model to study the relationship between age and carbon dioxide emissions, showing that Americans are retiring after retirement The "contribution" to global warming will decrease. If the following are true, which most supports the researcher's point is:. ['Research finds that as Americans age, carbon dioxide emissions gradually increase, and this trend will peak around 65 and then suddenly fall back.', 'Research reports suggest that countries with similar aging population structures and consumption patterns as the United States may find that their carbon dioxide emissions will decrease.', 'Studies show that Americans 65 years and older donate more charitable money to green funds that care about global warming than Americans of other ages.', 'Research shows that after World War II, the baby boomer generation ’s carbon dioxide emissions after retirement will gradually decrease after 2030, a significant reduction.']