B. 
because the more car the more carbon dioxide is released in to the air
        
                    
             
        
        
        
I hope the files I have sent help, the have the words
 
        
        
        
The reason is that something changed that caused them to be unsuccessful in their environment.
Sorry if it is not right.
        
                    
             
        
        
        
Answer:
Give me brainliest and ill make a question for 50 points
Explanation:
 
        
                    
             
        
        
        
Scientists have yet to prove that the current global warming trend is not part of the natural cycle of Earth. Many things are being done now, mostly focusing on emission controls placed upon industry and transportation.