Stop violence through reducing pollution consumption - scientific references

[Littleguy]

Lead poisoning can reduce learning capability and increase violent tendencies. Do you believe this?

References

www.who.int/en/news-room/fact-sheets/detail/lead-poisoning-and-health

I thought this has been recognised for decades. What's your point?

I thought this was one of those theories sometimes used to show that correlation does not equal causation?

en.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesis

I thought we had already by removing the lead from petrol? Is it still thought to be a problem?