How could colonists living above Venus lower the temperature at 1 bar atmosphere to 70-80 Fahrenheit?

In the book I am writing, I am going for a a partially terraformed Venus setting. I like the concept of floating cities, but I want to be able to make it a little easier to live up there. If colonist had around sixty years or so, could they lower the temperature at 1 bar down to 80 Fahrenheit? How would they do this?

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How could colonists living above Venus lower the temperature at 1 bar atmosphere to 70-80 Fahrenheit?

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