John, why do you believe reducing carbon emissions will lower the planets temperature?

I ask this question of people all the time and the only answer I get is because a group of scientists say so. Yet, to date no provable, factual evidence has ever been presented that shows any correlation between carbon emissions and temperature.

I wonder, if scientists said eating tree bark would extend our lives, would people start eating tree bark?

If by some miracle carbon emissions actually do increase the planets temperature. Wouldn't it be incumbent upon governments to legislate carbon emissions out of existence, they have that power. It wouldn't be the first time, governments have banned many things because of the harm they cause, so why not legislate a ban on carbon emissions?