As you think of what are the alternatives to this system -- it's important to find alternatives because it turns out that the U.S. is dwindling in its petroleum reserves, but it is not dwindling in its coal reserves, nor is China. There are huge coal reserves that are sitting out there, and we've got to start thinking of them as biological energy, because if we keep treating them as chemical energy, or engineering energy, we're going to be in deep doo-doo.
Enquanto pensamos quais seriam as alternativas para este sistema, é importante encontrar alternativas, porque os EUA estão a esgotar as suas reservas de petróleo mas não estão a esgotar as reservas de carvão, nem a China. Há enormes reservas de carvão espalhadas por aí, e nós temos que começar a pensar nelas como energia biológica, porque, se continuamos a tratá-las como energia química, ou energia de engenharia, vamos acabar no fundo do poço.