> why is it that for the ozone layer we got together and undid the damage but for climate change we don't?

Because it also happened to be profitable for a large company (DuPont), which was also the company largely responsible for the whole ozone layer thing. They lobbied against ozone layer protections while they had a patent on Freon, but as soon as it expired, they came up with a new more expensive alternative and started supporting environmental regulations forcing people to switch to the new one.