Lenas wrote:
Do you mean to say that a city in place of a rain forest is better for the planet?
There's no such thing as "better for the planet." What you mean to say is "Better for human quality of life (or even survival.)" And yes, destroying the rainforests in favor of city could potentially be very bad for human quality of life.
There's a certain degree of nonsense spouted by uninformed people who think they're being ecologically responsible that has its roots in creationism and religiosity. The Earth's environment is not naturally some perfect paradise that was designed for the life in it. Earth's environment has changed constantly over the last 4 and half billion years of its existence, and will continue to change. Life survives as it can adapt to those changes, and dies as it cannot. As the environment changes, one might think "This is bad for the Earth!" because they're thinking from the perspective of life currently existant on it, but everything changes (occasionally VERY rapidly), and evolution and natural selection allows life to adapt for it.
Humans do change the environment. We can't even say we do more than any other species (imagine what the environment would be like without bacteria, or plants, or insects, and you know we do not have the biggest impact among terrestrial species), but we do influence it. This change is not 'destroying the environment.' It's changing it. Everything changes it. There's no precious, delicate balance that we are custodians responsible for maintaining. It simply has never existed. The concern (and only concern) needs to be, "Are we changing it in a way that may negatively impact our own survival?"
That last bit is certainly a valid question.