For a question like this, you would need to understand what Christian teachings say about the environment (e.g. stewardship), and how a Christian would reflect this in their daily life. It may be important to understand the view of the Earth as intrinsically valuable, not instrumentally, so you could therefore give some explanation on what impact this would have. As this is not a direct "argue" question you would not necessarily need to include points for and against, although it would be important to understand the impact of a belief in God, and what environmental attitude one mught have if they were not a religious believer, as a point of comparison. Be sure to include examples! In your conclusion, you would simply need to summarize what you have said in the main text, and state what overall effect would be had.