This hour on The Colin McEnroe Show, we talk about how humans have imagined the world ending, and what it says about us.

Edward R. Landa is an adjunct professor in the Department of Environmental Science and Technology at the University of Maryland-College Park, and a scientist (emeritus) with the US Geological Survey.

Mary Nichols is a retired research hydraulic engineer with the US Department of Agriculture’s Agricultural Research Service Southwest Watershed Research Center in Tucson, Arizona. She holds a PhD in ...