Should Christians be environmentalists?

Some Christians say the our environment doesn’t matter because it’s all going to burn anyway. Revelation 11:18 specifically says that God is returning to destroy those who destroy the earth. The original Greek uses the word ges, not kosmos. This specifically means the earth spoken of is the physical earth, not some philosophical/social/spiritual context.  The idea that it is OK to destroy a gift of God because “there’s a better one waiting for me anyway” is so selfish. It ignores the needs of anyone but self.  It reeks of a wicked, spoiled child who says he can destroy that which his parents have given to him because they’ll buy him better ones anyway.  No wonder Donald Trump is their idol.