Francis Schaeffer is probably my favorite theologian, followed by GK Chesterton, CS Lewis and Malcolm Muggeridge. I like what Schaeffer has said about the environment. I found an interesting website on apologetics here. Here's an excerpt:
"Creation is not equal with God nor is it an extension of God, but “created things have an existence in themselves. They are really there.” As such nature has value in itself since God made it."
"Because God created all things and treats them with integrity, so should we. This is not pantheism, but rather a way of honoring the creator. Thus, as a human, I recognize that I am more valuable than an ant, but the ant is a fellow creature, both of us made by the same God. I have the right to kill him, but only under certain conditions. Schaeffer explains, “We have the right to rid our houses of ants; but what we have no right to do is to forget to honor the ant as God made it, out in the place where God made the ant to be. When we meet the ant on the sidewalk, we step over him.”