Can Global Warming really be stopped?

Check this out, if someones daily life does a 50% damage to global warming then they cut it down to about to lets say 1%. There is still that one percent affecting global warming, and it may not completely destroy the ozone layer now but it will sooner or later, right? Its just like we are delaying our death because unless the ozone layer can get smaller, then what people are saying to stop global warming is no good. But even if the ozone layer can get smaller or not, it wouldn't hurt to at least try some of these things. Like turning off the lights when there not in use or pluging out appliances that aren't being use. That actually saves you money, so it wouldnt hurt to try. now would it.