Declining reserves is exactly one of the biggest predicaments humanity faces - not only from fossil fuels, but from copper and other materials as well (making the entire 'renewable' transition highly questionable). Regarding the article's actual purpose: it is not defend a war, but to criticize those who instigate conflicts, then push their allies into the front line (both in economic, and in a human sacrifice stance) only to turn down any peace negotiations at every given chance.