Riding a bike does not cause pollution, and scientific consensus is that pollution causes global warming. Given these facts, which of the following does not contribute to global warming among the following options:
- 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


 

       Riding a bike  