We have to understand the connection between a seemingly "innocent" event such as throwing trash in a random place and something else happening thousands of miles away - the events can be interconnected and the various documentaries have been trying to make us think about that.

If our activity causes warming that causes more storms that causes species to migrate earlier to different parts of the globe than usual that causes unpredictable food for other animals which they were relying on and have done for years, which in turn means they can't reproduce or sustain their cubs meaning other animals might suffer as a result and suddenly the entire chain is broken, disjointed and collapses.

Humans have no idea how fragile the ecosystem is or how resilient it may be (since we've never had this many humans living at once, consuming at the rates we are and causing the warming we've been witnessing).