You are presented with the question "Which of the following does not contribute to global warming?" and the following answer choices: 
- nucleus of a cell
 - Flying in a plane
 - Leaving the lights on
 - haploid plants
 - a hydraulic system
 - Driving a car
 - Riding a bike
 - power stations

Now knowing that riding a bike does not cause pollution and scientific consensus is that pollution causes global warming, choose the best answer.


 

       Riding a bike  