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.
My doctor did comprehensive testing including the essential thyroid tests TSH, Free T4, Free T3, Reverse T3, and thyroid antibodies. Turned out my Free T3 was middle of the range. I personally feel terrible when my Free T3 is low or even middle of the range. Optimal Free T3 for my body is when it reaches top quarter of the normal range, so adjusting my thyroid medication dosage was an essential piece to my thyroid hair loss.