Since I live in a coastal area, where this type of energy can be exploited, conduct an investigation of that. and I throw myself as a result that would be an inexhaustible source. for me that would be on a large scale, but as you and I well know, you always need investment from private or state resources. the only thing that would slow it down is like the friend @andkill says,

but tomorrow a meteorite could also fall and we all died.