The major heat retaining component of the Green Planet Gases is water vapor. You also need rain to support green plant life. In gaseous (vapor) and liquid (moisture) form it has a high density for heat. You can see that by comparing how quickly the atmosphere cools off at night when you are overcast verses when you have clear night skies. An overcast sky contains a high density of moisture (liquid water), which can hold a higher density of heat.
An El Nino event is really a large scale Green Planet Phenomenon due to the large increase of atmospheric water vapor generated by equatorial heat evaporation (heated El Nino waters). The truth is El Nino is the dominant Green House Gas emitting event on the planet. Much greater then human influence. That is the truth the watermelons hope to hide from you.
watermelons-
Watermelon Environmentalism = Green on the outside but Commie Red to the Core.