TBH. Id challenge them to prove it DOES exist. Then go grab one of the studies that prove that wrong. Or the proof that NOAA temp data has been a lie for decades. Or that the Great Barrier Reef has regrown when they said it was lost for good. Sea levels havent risen since the great flood. The "caw farts" is a farce. The CO2 emitted by a cow is mostly reabsorbed by the plants they are eating. The gasses they claim are killing the atmosphere dont actually make it up that high.....