California’s largest utility company, PG&E, says it’s begun shutting off electricity to 800,000 customers, as dry, windy conditions have increased the threat of wildfires in 34 of the state’s northern and central counties. The unprecedented blackouts follow last year’s devastating Camp Fire, which killed 85 people — the deadliest blaze in California history. Investigators found that poorly maintained PG&E transmission lines sparked that fire last November. Climate scientists say hotter and drier conditions across California due to rising greenhouse gas emissions have made wildfires more widespread and more intense.