Is the Earth's climate changing? Probably, the evidence points in that direction.
Is the change due to human activity? There is evidence to suggest as much.
Can we actually reverse the changes? No one knows.
Does any of this matter? No.
Why? Because, while the finer points of the argument are scientifically interesting, social change is desirable simply because it will make our quality of life better. If you think that sitting in traffic jams, because the breeding class think that the school bus isn't good enough for junior, is a great way to spend time, then carry on as you are.
If you think that working nine to five, six days a week towards heart disease and irritable bowel syndrome is not a miserable waste of your time on this planet, then no change is necessary.
If you think that the new Ford Mondeo, wider than before, heavier than before, is an exemplary design path to follow, then ... Do you see where I'm going with this?