Recently, I gave a talk on “Climate Change: The Defining Challenge of the 21st Century” at Northwestern University and Loyola. The primary message was as follows: unless politicians and world governments move quickly, climate change will become irreversible. People must get involved (see Bill McKibben and 350.org). It is possible to bring carbon emissions down to the necessary 80% reduction level by 2050, but time is getting away from us. Still, the planet will warm likely greater than the two degrees centigrade, causing coral reefs to be largely exterminated and we will experience severe drought, wires, famine, and more intense storms. Find ways to lower your energy use. By doing so, you will save money and possibly the planet.