At least 100 people are feared dead after 30 deadly tornadoes devastated towns in eight states, from Kentucky to Arkansas, in a supercell thunderstorm that raged more than 200 miles, leaving behind scenes some compared to a war zone. President Biden has declared a major federal disaster and called for an investigation into the role climate change played in the storms. We speak to climate scientist Michael Mann about the role of climate change in the storms and climate denialism among Republican leaders. “Make no mistake, we have been seeing an increase in these massive tornado outbreaks that can be attributed to the warming of the planet,” says Mann, director of the Earth System Science Center at Penn State University. - Democracy Now!