I come from an alpine province with 90% water power. Most environmentalists that have criticism of any particular dam are not against dams per se. They might be

I come from an alpine province with 90% water power. Most environmentalists that have criticism of any particular dam are not against dams per se. They might be against a specific dam because it has significant impact on specific areas above or below it. And those concerns can be very valid. Biodiversity isn't killed in one big action, it is killed by many small ones over centuries. And you can't unkill it easily once it is gone.