[Titanscape (OP)]

Our dam in Syndey is covered in slightly toxic algae. What can be done by us and the government?

[JimBob]

Copper sulfate

[Titanscape (OP)]

Copper sulfate is not toxic to people and what does it do to algae?

[Andrew K Fletcher]

Dump your sewage and waste water on the land and reclaim the deserts by reforesting the coastline and remove the thermal barrier that curently prohibits moisture laden clouds from crossing onto the land and cause it to rain in the deserts instead of dumping human waste and billions of tons of enriched grey water in the rivers and ocean where it raises the fertility of the waters causing algal blooms and toxic phytoplankton blooms, which kills fish adding even more fertility to the water and sapping it's oxygen further. Over time, the forests would begin to change the weather patterns and your country will again begin to flourish. Or carry on the way you are and turn the whole continent into one huge desert where the only rain comes in flash floods washing away the last remnents of organic matter from the already impoverished soils.