The wildfires that raged last year from Paradise to Malibu made for California’s deadliest, most destructive fire season on record.

But the eruption of blazes marked another distinction for California, as one of the worst for the climate. In 2018, fires released more than 45 million metric tons of carbon dioxide into the atmosphere — the most in a decade and trailing only slightly behind 2008, when the state was also stricken by two of the largest wildfires in modern history.