Yes, if you can just shut off the sun for some time, we can definitely easily overcome global warming... ...
Albedo is important, being snide is not.
But warmer seas can also mean more evaporation, more precipitation and therefore more snow, higher albedo and a brake on rising temperatures, possibly even a new ice age. (It gets mentioned sometimes; an ice age is ironically a potential result of global warming.)
But it seems to me that effect will mostly be limited to higher latitudes. There's not a lot of snow around the equator, which receives the most sunlight.
But if we could somehow increase the Earth's albedo on a large scale, then that would absolutely have an impact.