Answer:
As an individual, absolutely nothing you do will make any difference at all.
I agree that the solution must come largely from the world's governments, but there are things I can do to reduce my contribution to global warming. I have replaced all my incandescent light bulbs with high efficiency ones. I am very conscious of turning lights and appliances off when not in use, and do not leave them in standby mode without good reason. I drive a fuel-efficient car and use public transport wherever possible. These are just a few of the things I think we can do as individuals.