Heavy industry, manufacturing and agriculture are three of the major causes of pollution of the Great Lakes system. The production of persistent organic pollutants (POPs) such as PCBs, DDT and dioxins, had previously been of principal concern. This does not account for all of the pollution, but are a majority of the blame. Chemical pollution, Plastic pollution, and Nutrient pollution have been devastating to The Great Lakes.
The causes of freshwater pollution are varied and include industrial wastes, sewage disposal, runoff from farmland, cities, and factory effluents, and the build-up of sediment. Emissions from factories and vehicles are released into the air.
Therefore, answers should be:
Industrial waste, sewage disposal and, runoff.
Effectiveness and safety?
Most of the "inhalants" that you will find in your house have worse effects than street drugs. The above mentioned "inhalants" can cause nausea, fever, vomiting, lightheadedness, unconciousness, and possibly death.
Steroids promote the growth of muscle
Maybe make it more clear cause i dont understand
