It is crucial that engineers – from students to those already practicing – have a deep understanding of the environmental threats facing the world, if they are to become part of the solution and not the problem. Is there a way to reconcile modern lifestyles with the compelling need for change? Could new improved technologies play a key role? If great leaps in the environmental efficiency of technologies are needed, can they be produced? Engineers are in a privileged and hugely influential position to innovate, design and build a sustainable future. But are they engaged or uninterested? Are they knowledgeable or ignorant?