Climate change due to increased green house gases and the thinning of our ozone layer by CFCs are both global problems. Interestingly, the world collectively has been able to make a significant effort in trying to lessen the thinning of the ozone. Please compare the world's efforts to lessen ozone to what we will have to do to decrease climate change.

This is a massive question with a lot of unknowns about the future of possible climate change solutions.
As the question states, the world has done quite a bit to introduce legislation that addresses the issue of climate change. However, not every country subscribes to the same solutions, and not every country makes climate change an important issue. For example, the Kyoto Protocol was put into place in 1992, and many countries signed on to its rules. However, not every country did, and some countries have even pulled out of it. The United States put forth the American Clean Energy Leadership Act in 2009, and there are many tax benefits for Americans that work toward using clean and renewable energies for their homes or vehicles. All of these things are good ideas and have facilitated changes to the environment. However, their impact has not been enough to turn climate change around.
One thing that does need to be understood about climate change is the idea that humans cannot stop it. Ice cores have shown scientists that Earth has gone through several severe changes in climate during the Earth's 4.5 billion year history. Humans might not be the only cause. If we are, then more aggressive measures will likely need to be taken. There probably is not a single method that will act as a magic bullet to stop climate change. However, reducing carbon emissions seems to be a step in the right direction. In overly simplistic terms, we have to stop burning fossil fuels at the rate that we currently are. How we do this is not easily resolvable. A reduction in the world's population would work, but that is unrealistic and morbid. Switching over to 100% wind, wave, tidal, geothermal, solar, and other clean energy sources is a solid solution, but those technologies are not capable of the energy density that is found within fossil fuels. They may get there, but scientists need time to figure it out.
https://www.c2es.org/content/congress-climate-history/

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