Pesticides when did we notice them?

Question

When and how did most people first become aware of the dangers of pectacide?

Answer 1

When Al Gore invented global warming.

Answer 2

The ball really started to roll when Rachel Carson published "Silent Spring" in 1962.

Surely people knew of their toxicities before then, but cost effectiveness was very desirable and people were just not aware of long term problems.

Answer 3

When the government decided to poision Veitnam with "Agent rainbow" and more on base "Agent Orange"

Answer 4

When kids starting getting Auetism