Effectively never. As technology improves, new reserves that weren't recoverable before become so. EG fracking, shale oil, tar sands etc. I think we will have

Effectively never. As technology improves, new reserves that weren't recoverable before become so. EG fracking, shale oil, tar sands etc. I think we will have a suitable replacement for oil long before it runs out. Likewise gas etc. https://www.nytimes.com/2009/08/25/opinion/25lynch.html?_r=1&pagewanted=all https://www.nytimes.com/2009/08/25/opinion/25lynch.html?_r=1...