The underlying problem is that human still can't stop reproducing. No doubt that human is the most successful species, but their reproduction is more successful than sustainment. That is the MAIN reason why the earth is having lots of environmental problem, (global warming, perhaps?)

The earth will not be able to sustain the exponentially increasing of the human population. So as long as human keep reproducing, we need to find other home we call earth, despite of our futile effort of preserving the environment because that is not the root of the problem.