Yawn: Retired Army general Wesley K Clark suggests that trace amounts of CO2 "will likely shake the foundations of global civilisation as we know it today"

Climate change: The next challenge for national security - Opinion - Al Jazeera English

But as former Senior Official of the National Science Foundation Bob Correll explained, the conclusion is inescapable: Earth is going to warm substantially, and soon. Perhaps, 3.88 to 5 degrees Celsius (7 to 9 Fahrenheit) over the next 80 years.
...the consequences will likely shake the foundations of global civilisation as we know it today.
...
Storms will be more violent; rainfall more intense, heat waves and drought more destructive. Climate models are able to predict the general areas that will be affected by these changing weather patterns. Africa and the American Southwest will be drier, the Arctic much warmer, with polar ice rapidly disappearing, and northeast Europe - at least temporarily - will be colder...The threat of mass casualties, political upheaval, and conflict within and between states will certainly increase.