You can tell how serious climate change is by looking at he actions of groups that do not have the luxury of ignoring the gravity of the situation. The United States Department of Defense makes its position clear in a policy statement published in 2014. The document begins:

Among the future trends that will impact our national security is climate change. Rising global temperatures, changing precipitation patterns, climbing sea levels, and more extreme weather events will intensify the challenges of global instability, hunger, poverty, and conflict. They will likely lead to food and water shortages, pandemic disease, disputes over refugees and resources, and destruction by natural disasters in regions across the globe. In our defense strategy, we refer to climate change as a “threat multiplier” because it has the potential to exacerbate many of the challenges we are dealing with today—from infectious disease to terrorism. We are already beginning to see some of these impacts.

These are not the words of a left-wing pundit. These is the U.S. military talking. They are getting ready for serious troubles ahead. Our house is going to have to be put on stilts, and we’re going to have to secure new supplies of food and drinkable water, and the means to get them to everyone inside. The military is not alone. Insurance companies are talking climate change seriously. Agriculture businesses are talking it seriously. We all will take it seriously, sooner or later. Here’s hoping for sooner. – Bill Nye