To explain ocean acidification to second graders, here’s a start: Think of carbon dioxide as an evil ninja.
He’s buried in the ground in the form of coal, oil or some other fossil fuel. Someone digs him up and lights him on fire, sending him up into the atmosphere in a plume of smoke, or perhaps a polluting helicopter. The stealthy ninja parachutes out and lands in the ocean, where he begins to turn the ocean more acidic.
The ninja also runs into a happy clam, whose shell is made of calcium and carbonate. But the evil ninja breaks the molecule apart, kidnaps the carbonate and locks it away where no one can get to it. With that fundamental bond broken, the shell dissolves, the clam inside dies, and sea life as we know it is under attack.
That, at least, is the way students from the Suquamish Tribe Middle School see the situation unfolding in our oceans, as they brainstorm ideas for an animated video that will help younger kids understand the mechanics of ocean acidification. It’s a problem that people like Paul Williams, the shellfish management policy advisor for the tribe, sees as a grave threat to their culture. As he explained to a room of 11- to 14-year-old students on a recent summer day:
The goal today is to make videos to explain what’s going on out on the water because this is your future. If any of you want to be fishermen or fisherwomen, it’s really up to you guys. This is something that’s happening right now and it’s getting worse. If we want to have any alternative to McDonald’s, we’re going to have to work on this. And I have to apologize to you because my generation couldn’t do it. It’s a shame to have to tell you guys that this is your problem…but it’s the truth and I think you guys are old enough to be told the truth.

