The changing climate due to human behavior is the overwhelming challenge of our time. The scientific knowledge is clearer than ever:if we do not take efficient and lasting actions to curb today’s largely uncontrolled greenhouse gas emissions into a future situation where low or close to zero emissions are the norm, mankind will be headed for a future of catastrophic change. Human life as we know it will be impossible in many places around the world. The most immediate effects will be a water sh...