Yes, you're right. What you're doing when harvesting tidal energy is introducing a friction like resistance on the moon as it revolves around the earth and on the rotation of the earth, and taking energy from it's energy of motion, that is, slowing it down. But I'd expect with the masses and velocities involved that this amount is miniscule and not even close to being measurable. That said, we didn't think we could impact the earth by burning fuel, and if something like this were adopted large scale the impact could surprise us and be a real problem.
Solar isn't as limitless as you'd think. It is limited to the surface of the earth, more precisely, the surface area of the 2 dimensional disk from the perspective of the sun. And on earth, that's what drives life, so harvesting solar energy on the surface is something that, if deployed beyond what we think we need right now, can have a negative impact on the earth. Harvesting it in space and beaming it down would heat the earyy up too, as the energy is used it produces waste heat which means on a large scale even using the energy on earth would have a negative impact.
Solar isn't as limitless as you'd think. It is limited to the surface of the earth, more precisely, the surface area of the 2 dimensional disk from the perspective of the sun. And on earth, that's what drives life, so harvesting solar energy on the surface is something that, if deployed beyond what we think we need right now, can have a negative impact on the earth. Harvesting it in space and beaming it down would heat the earyy up too, as the energy is used it produces waste heat which means on a large scale even using the energy on earth would have a negative impact.