Ask HN: What are we doing wrong now that will be painfully obvious in 100 years?

A lot of examples from the past show that people love to hurt themselves with their lack of knowledge: - bloodletting was a popular medical procedure up to 19th century - adding radium to toothpaste, hair creams and even water in the early 20th century And from much less distant past: - smoking - greenhouse gas emissions

What are we doing wrong now, which the general public isn't aware of currently?