What can be done to help improve the habitat in a lake that has been affected by acid rain?

There isn't much you can do. Only use an umbrella. Power stations try to reduce pollution. Many coal-burning power stations use flue-gas desulfurization (FGD) to remove sulfur-containing gases from their stack gases. For a typical coal-fired power station, FGD will remove 95 percent or more of the SO2 in the flue gases.