Have you ever thought about what it would be like if you had to pay a price to use materials in Nature?  Looking at Nature from an economic perspective, we are losing economic capital in Nature - rain factories, cost of air, water management, trees, ecosystems, species, genes, insect pollination of fruits and vegetables - bees alone are worth $ 190 billion or 8% of the total agriculture output globally.  Listen to Pavan Dukhdev's TED Talk from 2011:

http://www.ted.com/talks/pavan_sukhdev_what_s_the_price_of_nature