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.
Patients with reflux and Alzheimer's were found to have lower levels of T3 in esophagus and brain tissue than normal controls. Both groups tested normal on routine blood tests. For some patients with hypothyroidism, the TSH levels may not rise in the blood. I see this frequently too. The TSH will be perfectly normal or even low due to a variety of mechanisms. Routine tests then will be unable to detect it. Thyroid panels are too limited. A more comprehensive test would include looking beyond TSH to total T3 and T4, free T3 and T4, Reverse T3, and antibody levels commonly found with Hashimoto's disease (the most common cause of low thyroid function).