What do you think about the field of conservation and natural resources and how a Christian should keep an eternal perspective while working in this area?
I believe we as Christians need to be good stewards of the resources God has given us. Use it, reuse it, recycle it, and don’t abuse what God has given us. We should choose to respect the environment that God created and make sure we are doing what we can to keep it healthy and in a good condition. But also we should not feel guilty for using the resources He has given us.
Unfortunately, we have sometimes neglected environmental issues because they have been mixed in with liberal issues and many Christians haven't wanted to be associated with liberalism. We've been turned off to the pleas for protecting the environment because, for example, many people have been more concerned about protecting an eagle's nest than they have about protecting an unborn child. But we as Christians need to be more discerning about these issues and not throw out the baby with the bathwater, so to speak.
The following is an article I think you will find interesting: “Be a Christian Environmentalist” by Mary Beth Bonacci
Here is an article Randy Alcorn wrote entitled Caring for the environment: Should Evangelical Christians be concerned?
Another good resource is a book endorsed by Randy Alcorn and mentioned in the above article, Gardening Eden: How Creation Care Will Change Your Faith, Your Life, and Our World by Michael Abbaté.