Let me keep this simple. I had some “elaborate” thoughts lined up for developing how Christians should understand the ‘supremacy’ of Christ over creation; and how that impacts the way ‘we’ should engage the ‘Green’ rhetoric. But instead let me just provide the pertinent scripture, and let you all develop how you think this passage might impact the way Christians should think about environmentalism and ‘Earth Day’ (if you don’t have any thoughts, then just be edified through reading this theologically/christologically rich piece of scripture):

15(AI) He is the image of(AJ) the invisible God,(AK) the firstborn of all creation. 16For by[f] him all things were created,(AL) in heaven and on earth, visible and invisible, whether(AM) thrones or(AN) dominions or rulers or authorities—all things were created(AO) through him and for him. 17And(AP) he is before all things, and in him all things(AQ) hold together. 18And(AR) he is the head of the body, the church. He is(AS) the beginning,(AT) the firstborn from the dead, that in everything he might be preeminent. 19For(AU) in him all the(AV) fullness of God was pleased to dwell, 20and(AW) through him to reconcile to himself all things, whether on earth or in heaven,(AX) making peace(AY) by the blood of his cross.