CLAIM: A moderator for NBC News’s 2020 Democrat presidential primary debate suggested climate change in the cities of Las Vegas and Reno, Nevada, has put the regions in dire need of intervention by the federal government. VERDICT: The heat may be rising in Las Vegas and Reno, but that has not caused Americans to move out of the two cities. Quite the opposite, the populations of Las Vegas and Reno have steadily grown each over the last 30 years.