Our life as consumers seems light years away from that of our grandparents. But you don't change human nature. Optimism, for me, is the belief that we can spread the opportunity for everyone to be fully human. Sustainability, like music, is an impulse to make sense of the world around us. It is core to our humanity. If you only like one composer, or think all the best music has already been written, you have reason for pessimism. If not, it is within us to have good reason for hope