Why are biologists concerned about energy conservation?

Most of the methods of generating electricity are harmful to the environment. These methods include nuclear, hydro and thermal power plants. Thermal power plants pollute, first of all, the atmosphere, nuclear reactors and radioactive waste emit radiation into the environment, and hydroelectric power plants disrupt the ecosystem of rivers and often prevent river animals from moving. Therefore, if you save electricity, you will need to generate it in less quantities, and this will cause less harm to the environment.