The expression "Greenhouse Effect" is written on both sides (as of last version, October 2018).
1
Consequence
The text behind card n14 allows no ambiguity. Therefore the 2 cards have to be skipped together or not at all.
2
Other possible causes
When the ice pack melts, a white surface is replaced by a dark blue surface, which has a lower albedo and therefore absorbs more energy. This relationship is not essential but it does allow another feedback loop of the game to be put forward.
