How many petroleum based products go into cars? Plastic dash, wiring insulation, bumper strips, internal fittings, plastic fuse blocks, synthetic oils... then you have trucks, buses, aeroplanes and ships to contend with as well. Without plastic, nothing would move on this planet, at all.
Start with the car, the fuel efficient truck and aeroplane, then we conentrate on the plastic bottles, the food cartons and the biro's that are consumed in their billions every year. Start small, but think big, that's the ticket.