Economists don’t include all of the things that nature does for us for nothing. Some technologies would never be able to do what nature does. What would it cost us to take carbon dioxide out of the air and put oxygen back in, which all the green things do for us for nothing? It’s possible to do a crude estimate of what it would cost us to replace nature. Well, it turns out, one researcher estimated it would cost us $35 trillion a year to do what nature is doing for us for nothing. Now to put that in perspective. If you had added up all of the annual economies of all the countries in the world at that time, it would come to $18 trillion. So, nature is doing twice as much service for us as the economies of the world. And in the madness of conventional economics, this is not in the equation.”

-David Suzuki (geneticist and broadcaster)