Perhaps you've read about the Climate March that took place in New York City a couple of weeks ago.  Over 400,000 people marched through the streets of New York City to advocate for increased political and economic attention to addressing the impact of climate change.  Whether you believe in climate change (known previously as global warming) or not, I do not believe you can dismiss that we are obligated to care for the planet.  It's God's gift to us, and we ought to treat it with care.
     On this note, it's difficult to reject, for instance, that continued use of highly polluting sources of power will not eventually impact humanity negatively.  One look at downtown Beijing should convince anyone of this.  Nor is it difficult to ignore that the number of intense and unusual weather events has increased steadily in the last decade, or that many forests of the world are dying early deaths due to the proliferation of insect pests emboldened by warming temperatures across the planet.  Things do seem to be changing, often in very dramatic ways.
     The larger issue, however, is a moral one.  Why do we wish to preserve the planet?  It is of course our only home, and it is of course all that we materially know, at least at the moment.  But the planet is also, as I said earlier, God's gift to us.  Unfortunately, traditional interpretations of God's mandate ("rule and subdue") to Adam and Eve in Genesis have encouraged human depredation of the world, the abuse of the gift.  Yet the mandate is actually to rule with benevolence and care.  We are called to tend the world, to steward it for the future.
     God is asking us to watch over what we've been given.  He made it; we only occupy it for, in the big picture, a very short season.  As Psalm 24 notes, "The earth is the Lord's and all that is in it."  And what a grand world it is.