The key message from leaked drafts and interviews with the authors and other scientists: The big risks and overall effects of global warming are far more immediate and local than scientists once thought. It's not just about melting ice, threatened animals and plants. It's about the human problems of hunger, disease, drought, flooding, refugees and war, becoming worse.
The report says scientists have already observed many changes from warming, such as an increase in heat waves in North America, Europe, Africa and Asia. Severe floods, such as the one that displaced 90,000 people in Mozambique in 2008, are now more common in Africa and Australia. Europe and North America are getting more intense downpours that can be damaging. Melting ice in the Arctic is not only affecting the polar bear, but already changing the culture and livelihoods of indigenous people in northern Canada.
Clearly they don't have the math.