Solar 1. Water from underground wells may be required to clean concentrators and receivers, and to cool the generator, which may harm the ecosystem in dry climates.
Biofuels 1. is biomass ,ethanol, and Biodiesel. 2. biofuels is bad because it created carbon dioxcide and sulfur and releashes it unto the air. 3. also damages the ozone layer.
Uranium (nuclear) 1. Most nuclear waste has low levels (for example, disposable items that have come into contact with small amounts of radioactive dust)