if earth has warmed up only 1.2 degrees f. in the last 100 ys it wouldnt take much blocking of the sun to eliminate this slight heating

the simplest way to do this is w. a multitude of huge reflectors in the sky that could be retracted when the heat is needed

of course everyone would want to have a reflector located above ones house. an instant cloud

over the breeding ground of hurricanes many reflectors could be positioned to nip hurricanes in the bud