Definitely ourselves- we’re killing each other with religious wars, wars about land, global warming, gun crimes. Unless we realise that we need to celebrate each other and human life, we’re going to have a very hard time sharing the planet.
Global warming. It’s super dangerous and I think in 100 years we will get an idea of how screwed we all are. There are entire cities, countries and regions which will be underwater when the ice caps melt and there is nothing we can do about it.