Kamala Harris calls global warming an “existential threat.” Donald Trump dismisses it as a “scam.” Kamala Harris calls global warming an “existential threat.” Donald Trump dismisses it as a “scam.” Global Warming, Greenhouse Gas Emissions, Presidential Election of 2024, Alternative and Renewable Energy, United States Politics and Government, Environment, Solar Energy, Oil (Petroleum) and Gasoline, Water Pollution, Wind Power, Paris climate accord NYT > Science