We are not God. The earth was here before us and it has been given to us. The biblical texts are to be read in their context, recognizing that they tell us to “till and keep” the garden of the world (Genesis 2:15). “Tilling” refers to cultivating, ploughing or working, while “keeping” means caring, protecting, overseeing and preserving. This implies a relationship of mutual responsibility between human beings and nature. Each community can take from the bounty of the earth whatever it needs for subsistence, but it also has the duty to protect the earth and to ensure its fruitfulness for coming generations.
The full encyclical can be viewed on :-http://www.vatican.va/content/francesco/en/encyclicals/documents/papa-francesco_20150524_enciclica-laudato-si.html
Even the smallest action to care for the world can make a difference!!