Why don't most Christians care for the Earth considering the entire meaning of life?

Not sure if your "sifting" example is what Jesus had in mind brother. I would think that while God expects us to tend his Earth properly and with respect, he also knew that man would eventually invent industry, machines, oil, and automobiles....With that said, these are not the objects causing the sin and abominations God speaks of...........MAN IS ! Of course, there is much abuse...But man has abused life from the start....You only have to look at what we Americans are doing with mankinds' birth rate and how it's being defiled. How many of us can honestly say that we're obeyed God's commands of "marry one woman and have children within the family?" Seems to me that if we only obeyed that one command across the globe, we would not have the over population problem we're seeing in china, and the U.S. and the abuse from it as we speak.