Yes, we can see the impact. And what you are ignoring is that where you see light there is LIFE. Life that can do as it wishes. Life that can play and learn and socialize and even hopefully come up with the next energy system that will make all of this moot. Where there is darkness at night there is nothing going on. There is subsistence level existence in those areas and I've lived in quite a few of them. And they SUCK! Life is short and brutal. You want to live where there is no light at night? Expect a normal lifespan of 40 years. Get light at night and it jumps to at least 50 years. Get light at night and a good level of wealth and your life expectancy jumps to 60 years.
I don't know about you, but I like being alive. Enjoy your life for as long as you can and stop being afraid. Fear is the mind killer as the movie said. Far more will be, and can be accomplished when you are not afraid.
Afraid? Fear? You are making quite a leap there. Because I have the capacity to see and understand that we have an impact on our world you assume that I must be afraid of it? That I even think we should do whole lot about it? I've said nothing of the sort. I have merely said that I can see it. It can not be denied.
Now.... that is the starting point. What we do with the knowledge is debatable. What isn't debatable is that these folks who claim that man hasn't the capacity to affect his environment are not of sufficient knowledge, intelligence, honesty or a combination of those things, to be considered in the discussion. We have a significant impact on our environment. Do we use our knowledge and intelligence to manage this impact in the interest of preservation of our species? Or do we just continue head long into an unknown, disregarding this hard won knowledge, burning, pillaging and consuming without regard for what consequences might lie ahead?
Any answer is OK. The position of "hey, life is short, I'm gonna get all I can and my children, neighbors and future generations be damned" is a common one. I have next to no respect for that but you do get points for honesty.
And honesty is the key.
We do affect our environment. That's where we start.