1. United States
2. Letter

Repealing the scientific finding that greenhouse gas emissions endanger human health discards decades of established evidence and strips away the legal foundation of federal clean air protections. Greenhouse gases are tied to asthma, heart disease, heat deaths, wildfire smoke, and costly climate disasters. Transportation is a major source of U.S. emissions, and eliminating federal vehicle standards removes one of the most effective tools for reducing pollution. The consequences are significant: • Public health risks increase. • Taxpayers shoulder higher disaster and medical costs. • Businesses face regulatory uncertainty. • American automakers fall behind global competitors , who invest heavily in cleaner technology. Congress established clean air protections to safeguard public health. Undermining that framework invites legal challenge, market uncertainty, and long term harm to American families. I urge you to reconsider and uphold the responsibility to protect the health and economic security of the American people and future generations.