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Tidal is not a proven technology. The ocean environment is incredibly harsh on equipment. High-temp geothermal power generation is extremely site-specific, though ground-loop technology for heating and cooling is a proven technology that is woefully underutilized (though there are big challenges there as well, since ground loops take up space and done incorrectly overheat the ground temp/water table, etc.).
How would you define tidal as proven? Also correct there is no one solution for all areas. Unless you built a massive solar panel array around the planet I guess.
Which would solve global warming on its own