Climate change: Why 2°C?

These changes entail serious risks for our societies. Humankind now has only a small time window in which to meet the challenge of climate change and take steps to limit the global rise in temperature to a maximum of 2°C. In its latest special report, “The budget approach” (2009), WBGU demonstrates that global warming must not exceed the 2°C guard rail if dangerous climate change is to be avoided.