no
yes but it depends of how big the dam is
The answer you're probably looking for is hydropower.
Once the power plant is built, there is almost no pollution from the actual running of the plant.
No, wind does not cause pollution
The sun plays an indirect role in hydropower generation by driving the water cycle. Solar energy heats the Earth's surface, causing water to evaporate and form clouds. When the clouds release rain, it replenishes water in rivers and lakes, which is then used to generate hydropower. So, the sun's impact on hydropower is in enabling water resources to be available for use in hydropower generation.
Matter does not cause pollution. Human beings do.
There isn't any fossill fuels that don't cause pollution. All fossil fuels cause pollution.
they cause pollution because it is harmful to the environment.
pollution
soil pollution. burning can cause air pollution and breathing cause respiratory problems. water pollution.
They cause pollution because the chemicals put into the fertilizers run into the water; then causing water pollution.
It can cause marine dumping. It can cause global warming. It can cause sewage and wastewater. It can cause oil pollution.