Global Warming is Unequivocal

Summary form only given. Following a detailed diagnosis of the vital signs of the planet Earth by the IPCC, it has become evident that the planet is running a "fever" and the prognosis is that it is apt to get much worse. "Warming of the climate system is unequivocal" and it is "very likely" due to human activities. This is the verdict of the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC), known as AR4. Warming of the climate system is unequivocal as is now clear from an increasing body of evidence showing discernible physically consistent changes. Moreover these changes are now simulated in climate models for the past 100 years to a reasonable degree, adding confidence to future projections. This talk will go over the evidence for climate change, how we are able to say that it is due to humans, and what it means for the future.