But as much as I think the human species will win a Darwin award, there's really zero risk of "killing our planet". I mean, one could sterilize the entire surface of the Earth, and the Archaea would hardly notice. They extend kilometers below the surface.
I can't argue spirituality, enlightenment. "If you meet Buddha on the road, kill him."
While I personally believe we'd all be better off reconnecting with awe, wonder, our place in the universe... When's the last time you watched the Milky Way? Heard the birds singing without the roar of airliners? ...Those beliefs aren't actionable.
There are organizations that seek to preserve the possibility to view the night sky with minimal light pollution (http://darksky.org). I went to a campsite in New Mexico that is designated as a dark sky sanctuary recently -- it was amazing.
Science shows us there is no meaning, purpose, or grand truth. All life is a 4 billion-year old chemical reaction... born by chance in the universe's beautiful dance of physics, fueled by energy and bound by entropy. From dust to dust, the billions that came before us are as forgotten as those that live and those yet to be born.
But, yet, there is meaning.
We don't exist at the abstraction layer of quarks or microseconds, nor do we exist at the scale of galaxies or millennia. Questioning human existence at those levels is a philosophical divide-by-zero. We exist at the human layer, in the context of society, on the scale of under a century. Science gives us a solid foundational existential philosophy for higher order philosophy, which we can probabilistically derive from the evidence available and test as rigorously as any other aspect of our understanding.
http://chem.tufts.edu/answersinscience/relativityofwrong.htm
Bad accounting is killing our planet. Neglecting important parts of the balance sheet creates perverse incentives.