As followers of Christ, Catholic are called to work towards justice in all areas of life. This applies even to God’s creation. We are called to be just stewards of Gods gifts and this entails fighting against the exploiting of God’s creation. Admittedly there are greater injustices in the world, (i.e. abortion, genocide, and poverty) but we should be willing to fight wherever injustice is present.
Indirect Apologetic Application
Environmentalism can be common ground for Catholics and other groups in secular society. It can be a foundation where sin can be recognized as the cause of injustice. It is a situation where we must repent. It points to the propensity of modern man not to submit to reality but to try to exploit nature to fulfill narcissistic desires. C.S. Lewis said the following in regarding to modern culture;
There is something which unites magic and applied science [technology] while separating both from the `wisdom' of earlier ages. For the wise men of old the cardinal problem had been how to conform the soul to reality, and the solution had been knowledge, self-discipline, and virtue. For magic and applied science alike the problem is how to subdue reality to the wishes of men, and the solution is a technique. ~C. S. Lewis, The Abolition of ManSecular Environmentalists and Catholics need to come together to seek the wisdom of how each individual can conform and submit to objective truth. Not through a techological quick fix through domination, but by the road of knowledge, self-discipline, and virtue which is just stewardship.
Some links of interest:
Catholic Conservation Center