Caroline. let us look at the possibilities that the team have suggested.
Yes we are destroying our world. Climate change will in the next hundreds of years will probably make the Earth unlivable for humans. There might be some animals that will survive so life will survive even if we do not.
There are other things that could destroy our world. An asteroid strike killed the dinosaurs and if there is another strike it could kill humanity. It is reckoned that the Sun is about midway through it’s life. It will at some time begin to die BUT this will not happen for billions of years. When it does die the Earth (our planet) will also die.