There is a variety of reasons to go green, but most come back to supply and demand. We have a limited amount of resources available and more and more people using them up. If we want our future generations to enjoy the same standard of living we've experienced, we need to take action.
Green building is a great place to start, as buildings consume 14% of potable water, 40% of raw materials, and 39% of energy in the United States alone (according to the US Green Building Council). That's 15 trillion gallons of water and 3 billion tons of raw materials each year! If that's not enough to convince you, here are some other reasons to go green: