First we need to decide what needs to be done. Then we do it. And then we ask if it is possible.
Don't be put off by people who know what is not possible. Do what needs to be done, and check to see if it was impossible only after you are done.
Really, the proper study of economics is fulfilment, not consumption... It doesn't even matter if it's a green product or a green house... It's still consumption. What matters in this world is the fulfilment of people's needs and the fulfilment of their aspirations.