Over the course of 22 years, the IPCC has drawn upon the expertise of thousands of the best scientific minds, nominated by their own governments, in order to make sense of the complexity of unfolding environmental events and their potential impacts on economies and societies. The Panel has striven to deliver the “perfect” product in terms of its mandate, scientific rigor, peer review, and openness, and has brought forward the knowledge – but also the knowledge gaps – in terms of our understanding of global warming.