A September 2019 study shows exposure to extremely low levels of glyphosate, the primary chemical in Roundup and approximately 700 other glyphosate-containing herbicides, result to changes in breast cells, causing tumors ("Glyphosate Primes Mammary Cells for Tumorigenesis by Reprogramming the Epigenome in a TET3-Dependent Manner," Manon Duforestel).
Breast cancer is going up at a very alarming rate. About 13% of women in the U.S. have breast cancer and that prevalence is said to soon be closer to 20%.
Rather than walking, running, etc., "for the cure," wouldn't it make more sense to have those large groups of people, even children, each write a letter voicing their concern about the excessive use of Roundup and other cancer-causing pesticides, especially neonics like imidacloprid, which are synergistically killing almost all living organisms. They could send their letters to the Environmental Protection Agency, their state and county boards of health, their governors and the president of the United States.
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Maybe writing a letter of concern asking for Roundup products and neonicotinoid insecticides to be banned is not as much fun, but if enough people actually wrote their own letter, it could have a significant effect, especially just before an election.