Hasbeen,
Well, everything humans do to improve their existence is detrimental to the natural environment.
Mostly it's just utterly unnecessary excessive frivolities. Whilst cement does cause pollution, once done it's generally in place for many years unlike plastic & steel glass fibres & resin etc etc.
A lot of times, pollution is unnecessarily increased by poor design from poorly educated engineers for the just as poor mentality masses.
Traditional dam design leaves a lot to be desired. Perhaps it could be improved by making the designers live down-stream.
But, to solve or rather make the electricity supply problem less of a problem, small nuclear power stations are probably the best option at this stage. They could perhaps be taken out of decommissioned war ships & modified for land-based use but the main thing would be to keep these plants small to prevent future Chernobyls or Fukushimas !

Interesting comments thanks.

Indydivual- Good points on "Nr 1 problem is over-demand, Nr 2 problem are the people using more than they need!"

Indyvidual- "prevent future Chernobyls or Fukushimas"
Fukushima's issue was a lack of modern safety systems- they were GE Reactors- but the retrofit was considered too expensive.
I suspect that Chernobyl suffered for a similar reason.

Canem Malum,
Cheers for that. Although not exactly flavour of the month, Russia appears to do what should be done elsewhere. Considering how the West prides itself on having superior technology, they don't appear to use superior thinking for electricity !

https://theconversation.com/russias-floating-nuclear-plants-to-power-remote-arctic-regions-19994

Although we see propaganda about how nuclear power is "too expensive", it actually stacks up very well, and it also stacks up well in terms of safety.

https://ourworldindata.org/safest-sources-of-energy

France gets 70% of its power from nuclear reactors and is the world's largest exporter of electricity. Its energy prices are well below the average for Europe, although not the absolute cheapest. The Scandinavian countries do better, but this is because of an abundance of good sites for hydroelectricity and easily accessible geothermal power (in the case of Iceland).

https://www.energycouncil.com.au/analysis/international-electricity-prices-how-does-australia-compare/

It is never explained how the firming of solar or wind power can be done at a reasonable costs or how we will deal with the enormous waste problem from solar cells that cannot be easily recycled at the end of their lifespan. Wind turbine blades also end up in landfill.

https://www.abc.net.au/news/2022-06-21/wind-turbine-waste-landfill-recycling-costs/101168442

Divergence,
I believe the Sun is just one huge lump of nuclear energy & guess where we'd be without it ?

Wind turbine blades can be recycled into the hobby field which is suffering from high prices for balsa wood which is used in wind turbine blades, or so I read.