Concrete, steel and metal scrap. 2m x 1.6m, 700kg.
When the last drop of oil on earth is consumed, hydrocarbon-fueled vehicles everywhere will rest forever where they lie, rusting monuments to a bygone age. Population explosions based on a superabundance of resource must collapse when that resource is depleted. Mass extinctions follow, along with rapid changes in conditions that only the most adaptable species survive. Ironically, such events in geological history have created the oil deposits that have allowed the human race to usher forward it's own mass extinction. Cars are dinosaurs. Hydrocarbon based civilisation is a dinosaur. And if, as seems likely, we are unable to change our ways, humans will be a dinosaur.