Humans cannot do anything to stop the natural cycles of the earth. You can, however, do some neat things that will impact your surroundings. Green rooftops have a cooling effect on their surroundings and they act to scrub pollution from the air - they are basically just grass planted on top of buildings, but they can have a big impact on a city.
Air moves over the whole world evenly. The concentration is essentially the same everywhere. There is nothing Cuba can do that would have any measurable effect over Cuba.