So what is the Earth's normal temperature?
What makes you think that's not a stupid question?
It is one remarkably stupid question. According to the stupid logic behind it, there would be no problem if earth got so hot that the oceans boiled, because there's no "normal" temperature for earth. Same with the stupid, stupid argument that global warming is not a problem because the climate is always changing.
That's reason #2 why everyone ignores deniers; their science and logic always suck hard. Reason #1 is that they're corrupt political cultist frauds, and reason #3 is that they just whine about everything.