Who benefits and who suffers? Our ecological overshoot and cause of mass extinctions are measures of our larger earth systems predicaments, of which global heating is an integral and causative part. Nuclear energy requires fossil fuelled industrial systems, for fuel, build and life cycle, as does renewable tech. Our problem is too many people requiring too much systems expensive technology. I=PAT. As a top life systems predator, we are limited by long term carrying capacity of biosphere cycles, and the physical and mental abilities of our now under-utilised bodies. Our brief history breaking energy technology spike puts a spike in both