Answer:
Test the effect of ultraviolet radiation on bacteria growth
 
        
                    
             
        
        
        
All energy sources have some impact on our environment. Fossil fuels—coal, oil, and natural gas—do substantially more harm than renewable energy sources by most measures, including air and water pollution, damage to public health, wildlife and habitat loss, water use, land use, and global warming emissions.
        
             
        
        
        
rain/condensation/precipitation
something like that