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If someone says, "The Earth is Flat," and you believe him, and tell other people, you're still a liar, you're just an honest liar.
I'm willing to accept that you are honestly and earnestly spreading lies that you believe. It's a distinction you don't seem to get.
The words are necessary because the icecaps melting will be a big deal. We need to dispense with lies about the science, right now, and I won't stop saying it.