If you guys want an industrialized, consumerist society with >7 billion humans, there is no way for that to be kept without polluting the earth.
Wanna know why? Second law of thermodynamics: the total entropy of a system either increases or remains constant in any spontaneous process; it never decreases.
You think that we humans can undo entropy by making fine machinery? Wrong! For every machine (computers, for instance) we make there is a greater amount of chaos introduced into the planet than what we undid.
The more energy we consume, the more entropy there will be. That's basic thermodynamics. So unless we change our lifestyles to something more minimalistic, entropy in the earth will continue to rise.