This quick TED talk entry is courtesy of TED.com. Every day, we use materials from the earth without thinking, for free. But what if we had to pay for their true value: would it make us more careful about what we use and what we waste? Think of Pavan Sukhdev as nature’s banker — assessing the value of the Earth’s assets. Eye-opening charts will make you think differently about the cost of air, water, trees …