Gavin Newsom is raising alarms on climate change again"and getting basic facts wrong. The California governor vows to sue the federal government over the Trump administration's repeal of the Environmental Protection Agency's 2009 "endangerment finding," the main legal basis under the Clean Air Act for mandating reductions in carbon-dioxide emissions. Mr. Newsom claims the reversal will trigger "more deadly wildfires" and "more extreme heat deaths." Age-adjusted heat-related death risk in California has risen modestly in recent decades"enough to account for 90 additional annual deaths likely linked to higher temperatures. But he omits the other side: Warming has helped reduce age-adjusted cold-related deaths by more than 5,000 a year. Citing only the tiny heat increase while ignoring the large decrease in cold-related deaths is misleading.