How can I get back at people?

I hate people. They have taken my land, taken my resources, polluted my waterways and killed/maimed many of my friends and family members. I can't even swim down my once safe waterways without the constant fear and paranoia that I'll get injured at any second by one of their boat propellers. My kind is endangered and may go extinct in the near future. My kind is just one of many kinds that have been wiped out by the bastard species known as humans. What can I do to get back at them?