The same way not everyone agrees that climate change is a real thing.
now it's 'climate change' - last decade it was 'global warming' ... but it's getting colder.
Conclusion: the smartasses aren't all that smart. Scientists aren't infallible gods.
More questions?
Maybe you admire the scientists and follow them blindly - others don't and think for themselves. Refering to Bitcoin now, not climate change...
Different scientists have different opinions, assumption, hypothesis and way of working. Just because someone says unicorns fart rainbows in the future and that someone is a scientist with credentials doesn't necessarily make unicorns fart rainbows in the future. (same as the unthinkable happened and bitcoin crashed another time in january. That wasn't planned that way ... so why should unicorns now fart rainbows again in the future? I don't believe in a unicorn until i see one)
Oh, fuck. So you ARE one of those people that think climate change is not real. There's no point arguing with you, then.