Farming, which in Europe and Asia stems from an invention around 10,000 years ago, was the cause of hierarchy and inequality.

I've read that farming of tubers in some islands in the Pacific has existed for 25,000 years. I don't know whether that farming also resulted in increased inequality and violence, but I suspect it did: in some places in the early 20th century, "big men" (and other would-be big men) competed to organize their relatives to produce a big surplus. Until European colonizers stopped this, they could use the surplus to recruit lots of followers as a war band to raid neighboring groups.

This doesn't prove that intergroup warfare was nonexistent before farming.

Loading a Website Should Not Be a Copyright Violation.

Facebook's censorship rules are sometimes incomprehensibly strict. Many women's accounts have been turned off for posting "men are scum".

Some men are scum, but not all. It is unfair to generalize that statement to all men. People should ideally know better than to be sloppy in generalization, even if they are justifiably angry at grave crimes.

However, is it right to gag people for unkind sloppiness like that? Clearly not.

Farm antibiotics spread into surrounding land and create antibiotic resistance across wide areas.

Red List: Thousands of Species at Risk of Extinction Due to Human Activity.