When pollution is caused by nutrients and fertilizers, this is called nutrient pollution, and it leads to an overproduction of algae and other aquatic plants. This overabundance of plants and algae causes problems, because they cover the water surface and prevent sunlight from reaching the plants underwater.
Reverse T3 is actually an antithyroid -- T3 is the active thyroid that goes to the cells and stimulates energy and metabolism. Reverse T3 is a mirror image -- it actually goes to the receptors, sticks there, and nothing happens. So it blocks the thyroid effect. Reverse T3 is kind of a hibernation hormone, in times of stress and chronic illness, it lowers your metabolism.
Most doctors only run one specific test to check the thyroid (TSH) and that is just not enough of an indicator of thyroid function. Some more accurate test markers would be T4, T3, Reverse T4, Reverse T3, TPO and TSI. (More info and what to look for with these test markers coming soon!) What is the Thyroid gland?