The subject of Creation Care is becoming an important one within the Christian church. "Creation Care", rather than "environmentalism", is the term used by many evangelicals to refer to the responsibility that followers of Christ have to take care of God's earth.
Influential Christian thinker, Francis Schaeffer once said, "... nature: it is not our own. It belongs to God, and we are to exercise our dominion over these things not as though entitled to exploit them, but as things borrowed or held in trust. We are to use them realising they are not ours intrinsically. Man's dominion is under God's dominion." [From his book Pollution and the Death of Man]
Issues such as the environment, ecology, pollution, and global warming should interest Christians, as we are called to be good stewards of God's earth.
For a good introduction to a biblical theology of Creation Care, click here for a free PDF of a chapter by Bret Stephenson and Stephen Bouma-Prediger from their book Living the Good Life on God's Earth.
Another very good book on this topic is: For the Beauty of the Earth: A Christian Vision for Creation Care. The Evangelical Environment Network also has an informative web site. Click here to access a website on Creation Care for pastors.