Ozone hole? We recognized the ozone layer had developed a hole which was growing. We identified the cause. Globally agreed to ban CFCs and implement replacements. Hole is mostly gone today.
The different between the two is the size of the CFC lobby (a single product category for diversified chemical companies) vs. the oil lobby (a sprawling industry): the oil lobby has corrupted many governments and politicians around the world to deny, delay, and prevent action because money. With ethical leadership, it is achievable, but this is rare and not enough action will ever be taken until it is far too late. Humanity has chosen to allow the greedy rich to risk omnicide and ecosystem collapse.