There are really two different answers to this question.
First is what could be done on a scientific level. We could absolutely reverse what has happened, we are nowhere near a point of no return at this time. If we just shut down all greenhouse gas emissions tomorrow the world would return to normal.
Second is what can be done on a practical level. This answer is very bleak. The reality is that there is very little that can and will be done to stop climate change. It requires too much work by too many countries. It would take massive changes in worldwide manufacturing, shipping, and developed countries to build renewable infrastructure for developing countries.
Our best bet is geoengineering, but people don’t really care for that.
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