Human beings were created by God in His own image. And God gave humanity dominion over the earth. The environment is here for us - not the other way around. Flora and fauna are natural resources to be used and conserved - not conserved for their own sake but for future generations of human beings to use.
Imagine a world without brothers, sisters, aunts or uncles. What a horrible world this would be without family relationships.
By the way, if you think about it, unless you're a first-born, these folks think you should cease to exist. You are killing the planet. And none of you should ever have been born.