Anybody in their 30s or 40s now will definitely be living in a world where electric cars, charged by renewable energy such as solar or wind power, will be the majority of vehicles on the road. Major trucking companies have already put orders in for the Tesla Semi based on ROI for delivery in 2019. AND, they release an electric car that does an 8.9 second 1/4 mile with a 600 mile range at highway speeds.Gasoline and diesel engines will go the way of the steam engine in the next 30-40 years.