I guess the answer is nature . I'm not sure . 
        
                    
             
        
        
        
The two that make green is blue and yellow
        
                    
             
        
        
        
He constructed the music as a child's introduction to the orchestra, with each character in the story represented by a different<span> instrument or group of instruments: Peter by the strings, the bird by the </span>flute<span>, the duck by the </span>oboe, the cat by theclarinet<span>, the wolf by the </span>horn<span> section, and so on.</span>
        
             
        
        
        
The central idea is that using solar power is better for the economy, environment, and society.