In the first edition of What On Earth! Phil and Jonathan chatted with Chris McMahon of Bristol University on the challenges of sustainability and a circular economy from an engineering perspective. Can we engineer ourselves out of the net zero challenge with continued human ingenuity? Or have we reached the peak of incremental change that has now created complex systems and processes which now heighten our circularity challenges. Learn about Jevons paradox and the multi-polar trap that explain our current challenges as society and possibly add a few titles to your reading list!