@Gerry McGovern 3/4ths of the Earth surface is covered in water, water is abundant, fresh water not so much but we can covert salt water to fresh water with the addition of energy and we can make all the energy we need for the next 1000-10,000 years with molten salt breeder reactors, and until the Sun consumes the Earth with controlled fusion. Instead of fearing the future, adapt and engineer it.