Global warming / tsunami link shot down

Let's review, class. The Six Degrees of Global Warming game, as applied to the tsunami disaster, goes like this:

• Global warming leads to "a creeping rise in sea levels"
• Higher sea levels make tsunamis worse

...and thus the destruction was presented as de facto evidence of global warming.

It's all nice and clear cut... if only it weren't for the nagging little detail that sea levels in the Indian Ocean basin have been declining over the last half century. Ooopsie.