be found in shallow waters, giving vreni a rare opportunity to get a good, long look at them. they're worth the attention. greenhouse gases are not just warming the world. they're also increasing the acidity of our oceans. here in the fjord, the waters are naturally acidic. >> they are a great case study for ocean acidification because the prognostics say that the oceans in the world in 2100 will be like the fjord here, and this gives us lots of opportunities of research.