Mechanic analogy doesn't really apply to climate change. You'd have make the car drive forever, become increasingly costly, eat your food and kill people while the mechanic will be able to repair it if you bring it in everyday for a long time. Bringing it to the mechanic would then also slow the deterioration and slowly make it better instead of it just getting worse.

It's a bit late for getting 1800's climate back within our lifetime but it's not to late to prevent it from getting worse.