[island911]

Internal combustion engines produce much more water vapor than they do CO₂ - Octane containing only 8 carbons, but 18 Hydrogen atoms.

Atmospheric water vapor is a MUCH larger "greenhouse gas" than is CO₂

Of course no one worries about looking for ways to pull water vapor out of the atmosphere, for one simple reason - rain.

Everyone knows that when too much water vapor accumulates it rains. -aka "Water cycle."

Yet somehow (massive propaganda campaigns) people don't know that atmospheric Carbon also cycles. - plants are quick to take any CO₂ they can grab. -note that CO₂ is pumped into grow-houses to gain crop yields more quickly.