My favorite way of explaining the problem as it stands now goes like this:

The Earth has a refrigerator built into it. The combination of ocean currents and polar exposure to space during the Northern Hemisphere winter (especially) acts like the circulating coolant in a refrigerator. When the North Pole is tilted away from the sun, it is a very efficient condenser coil blasting heat into space.

The CO2 we are dumping into the atmosphere is the dog hair and cat toys crammed into the refrigerator's condenser. At some point, the refrigerator fails because everyone is too fat to get down on the floor and clean it out, and nobody wants to get rid of the cats and dogs (corporate profiteers) who keep shedding and forgetting their crap under the frig.

The current state of the Earth is that everyone is waiting for the Memorial Day sale to replace the refrigerator, even though they can hear the compressor running and smell it overheating all the fucking time, right NOW (hurricanes, floods, fires, heat records, diseases).