Enviornmental Damage and Possible Solution in Lakes

Here are a few interesting articles outlining some of the damage humans have caused to lake biomes, as well as proposing how to repair and re-balance the biomes.
http://www.allbusiness.com/professional-scientific/scientific-research/508960-1.html
http://articles.latimes.com/2001/mar/18/local/me-39199
http://current.com/1158u4c

Basically, the overuse of fertilizers in agricultural practices has led to large amounts of runoff into lakes. This causes toxic algal growth, cutting of oxygen supplies to fish in the lake, sometimes permanently damaging the lake's balance. Here is a direct quote from the "allbusiness.com" article. "It could take a thousand years for lakes to recover from the damage done by humans in only six decades, claims limnologist Stephen R. Carpenter of the University of Wisconsin-Madison. Due to the extensive use of fertilizers, an enormous buildup of phosphorus in soils in lake watersheds is putting the lakes at risk of eutrophication for centuries to come, says Carpenter, an authority on freshwater lakes. Eutrophication stimulates toxic algae growth and chokes off the oxygen supply in the lakes, killing fish. The only way to reverse the damage is to substantially change soil management to reduce soil erosion, says Carpenter, who also recommends developing larger buffers around lakes and streams, restoring wetlands, and improving manure storage and handling processes in order to reduce phosphorus runoff."


Problems with acid rain caused by the burning of fossil fuels are also prevalent in many lake biomes around the world. The acid rain falling in lakes is positively charged and repels similarly charged calcium, which is needed for all living organisms and is critical in the keystone species of many lake environments. 
Obviously, humans will have to find new fuel sources and less harmful fertilizer in order to stop damaging lake's ecosystems. However, it will still take several hundred years for some of these lakes to recover, and it will be necessary for humans to safeguard these damaged lakes for many generations to come.