It has been said that humans are bad for the environment, but actually humans can be helpful for earths ecosystem in the long run. For example, sooner or later a comet will strike the earth, humans will be the only beings that can avoid such a catastrophic event and therefore saving life on earth. So actually the human resource exploit (e.g. Wood, gas processing) is basically an ''investment'' for advanced civilizations that will have the capacity to avoid natural disasters.