In a few centuries, the Earth will be devastated by catastrophes among which : climate change, lack of resources, zombies, other fucked-up creatures... But happily, there are people who want to stop that. We are those people. But they won't let us save the world. They think time is immutable and cannot be changed. So, as a scientist, and above all, as a humanist, I say Bullshit. I say Bullshit, but not only, I say we can change things, I say we have to change things. I say mankind has to change.