A difficult concept for many to remember about Climate Change is that the changes will not be linear. The systems are too complex. Like the straw that broke the camel's back, we will one day burn that ton of coal that boosts the carbon dioxide concentration over a tipping point.
This article from Mother Jones Magazine points out some of the dangerous tipping that could occur.
Thirteenth Tipping Point by Julia Whitty
In an article in the LA Times, Whitty says:
"Many secretly perceive global warming to be an insoluble problem and respond by circling the family wagons and turning inward. Yet human beings are born with powerful tools for solving this quandary. We have the genetic smarts and the cultural smarts. We have the technological know-how. We even have the inclination."
Whitty in the LA Times
Now is the time to start to act!