Human activity has caused Las Vegas to warm — but not in the way you may think. Last week, Climate Central released a report on the country’s fastest-warming cities since 1970 . Ignore the folly of using a single year as a baseline. Reno and Las Vegas topped the list. Reno’s average annual temperatures have increased by 7.9 degrees. In Las Vegas, the increase was 6 degrees. That’s significantly higher than nearby cities. Sacramento, California, is up 2 degrees. Los Angeles is only up 0.1 degrees. Climate Central blames the higher temperatures on greenhouse gas emissions . Burning fossil fuels releases additional carbon into the atmosphere. That extra carbon, the theory goes, traps heat and increases the Earth’s temperatures. For the sake of argument, leave aside any understandable skepticism you have about this contention. Assuming it’s true shows how mistaken global warming alarmists are. Start with this.…