RE: In 20 years, water demand will exceed supply by 40 percent
Ethanol, at it's heart, is the product of converting solar energy into chemical energy. Whether you extract ethanol from crops or refine crude oil, you have to spend energy to get a usable product.
Migration from rural areas that have supplies of groundwater to cities without adequate infrastructure is mostly happening in the developing world. Here in the USA, people are moving away from cities with existing infrastructure to suburbs that need new infrastructure - and then commute back into the cities. Therefore the push for smart growth.
It's easy to be complacent when you don't live in 1 of those places that's short on food or water.
