What do you think about the falling sperm count of men?

There is an article in the Guardian that Researchers say that by the years 2045 to 2050, that men will be mostly sterile. Researchers have been watching it for years and say sperm count has drop by like 40 percent and it's dropping fast than expected. What is your take on why.

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There's more than 30 video's on youtube talking about this.
What do you think about the falling sperm count of men?
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