Individual liberty. Without it, the collective is meaningless. There's no way humans can destroy the planet, although we could do a lot of damage to the lifeforms on it. Worrying about "the planet" is what the elite who run this world want us to do. That's silly. The planet will always be here. We need to care about ecosystems and ecological diversity, sure, but "the planet" will not fall apart. It will be fine no matter what us silly humans do. What we need to focus on is freedom. Without it, nothing else matters. If you don't have freedom, everything else (even your life) can be taken from you.