The new Noah movie is said to be about environmentalism. Bill Mar says it is about mass murder. The Bible says its about rejecting God and God dealing with mankind's sin by an act of Grace in allowing people to start over the human race. People do not want to acknowledge God or true righteousness or His Justice or His Mercy because they would the have to admit their own sin and accept that He alone can wash it away and forgive them. Real Justice would requires a penalty for sin and rebellion and God sent Jesus to pay that penalty..
Environmentalism is not our original purpose or primary responsibility. God made us to Have fellowship with Him. Our responsibility to Reign on Earth was training to reign with Him for eternity. When we abdicated our Reign and authority to Satan by choosing to believe him and not God we brought sin and corruption into the world and it corrupted all of creation. Our own DNA and understanding of who we were created to be has been corrupted.
While God does not want us to needlessly harm His creation it can not and will not be healed or restored until the new Heaven and Earth. So Our purpose is one of reconciling people to God and Growing in our walk with Him as we Advance His Kingdom in the Earth among all peoples. Caring for the Earth and all life on it is a responsibility but not our purpose.