Sanders, a socialist who supports the radical Green New Deal climate change plan, spent approximately $1.2 million to fly on a private plane — likely to get him back and forth from Washington, D.C. and Iowa or other campaign stops as the primary escalated.

Former Vice President Joe Biden spent the second-most of the Democratic presidential candidates, with his campaign spending just over $1 million on private airfare. Sen. Elizabeth Warren (D-Mass.), spent $720,518; former New York City Mayor Mike Bloomberg spent roughly $646,000; and former South Bend, Indiana, Mayor Pete Buttigieg spent $323,518.

Observers have taken notice of how climate change alarmists like Sanders seemingly contradict themselves by flying private while warning of the potentially irreversible damage of CO2 emissions.