Assuming climate change is caused by emissions of carbon dioxide, solving it means reducing these emissions worldwide. The best strategy is to focus on the biggest countries that are the highest carbon dioxide emitters: China, the United States of America, India, and Russia.
This is the best strategy because the reduction of such emissions is infinitely more efficient when it is undertaken by governments, and the larger the overall emissions of the country, the more efficiently the country can contribute to solving the problem. For instance, one million dollars spent in France to reduce the emissions of France would be better spent to do the same in China.
So what can we do? Well, we can give them money. We could for instance set up some international bank account on which anyone in the world could deposit money, and that money could only be used to reduce the emissions in these four countries. We could think of various systems to avoid that the money would be used for something else. For instance, by also setting up some international institution that would evaluate the results of these countries on a yearly basis, and only give the funds when a reduction has been observed, perhaps with some reward, etc.
But we probably will not do anything like that. Instead, people will waste time and money to have more solar and wind energy in their own countries, or will just not care.
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