If you replenishtheice sheetsandfrozenwatersof the high latitudes, morelightwillbereflectedback intospace, soreducing the warming of the oceans and atmosphere.
Assuming that humans will find something better to power the world with than carbon dioxide-emitting fossil fuels in the next one or two hundred years, that total warmingback then was greater or equal to what we are likely to inflict on Greenland.