Free energy will be of extreme benefit to humanity. We simply need to be mindful of the consequences that can come in other areas.
I agree with you quite alright. Even though at present we do not know enough about the sun chemistry to actually know the fallout we will have someday, but it is sure that they will be consequences. To every action, there's a reaction. It's the natural law of cause and effect, we can't deny simply because we don't know it yet. Also, how about the materials we used in extracting this, having too much unnecessary panels and inverter means growth in waste pollutants when they become unused. Moderation, like you said, is key.
Sadly, we see this same mindset on here. Many are still engaging in that behavior. The fear that resides within us of not being enough means we have to get more.
I put up a post about this about two hours ago, where I looked at the future of Steemit and express my concern whether we'll end up another tower of Babel. Greed, selfishness, nepotism(at extreme) and the rest are languages which do not speak well of the future here. A lot of people just want to milk as much as they can from the community before it collapse. I hope many people will get to read this and have a change of heart. If we must survive, long term community sustainability must supersede short term self interest.