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The only useful sources of energy are:
Fossil fuels
Nuclear fission
Nuclear fusion
This doesn't mean that newer energy sources can't be discovered, invented or otherwise attained... But they cannot be this inefficient and expensive.
The real problem with 'renewable energy' probably isn't even cost, even though they get massive government subsidies. It's mostly reliability.
It also has higher waste to create and maintain than traditional energy.
The plasticization of our oceans is only just beginning if we are forced down that route
Personally I believe all the 'microplastic' stuff is just alarmism and 80% of it is due to countries that dispose of their waste improperly like China.
But the EROEI (I hate using that term since the eco-doomers like it) on solar panels in particular is very low. Wind turbines are better. But the best energy source we currently have is natural gas. The next step should be either mass-produced nuclear fission with thorium, or nuclear fusion.
I see batteries in your future!
That's what I'd be studying if I wanted to be the next Big Thing.