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Firstly, even in the absence of human activity, global warming is not something that will be in thousands of years time. The Earth went through a minimum temperature about 400 years ago (a couple of centuries before the industrial revolution), and has been warming since them.
some pollutants were actually helping to cool the climate
The reality is that there is no such thing as a zero cost action
If the whole population of Africa used the more energy efficient light bulbs, only a small percent of CO2 emmisions would be reduced. So no, it doesn't matter.