Q: What do Sam Waterston and Sigourney Weaver have in common?

A: They are both actively drawing public and legislative attention to the issue of ocean acidification.   That is, the decrease in the pH of the sea as a result of its absorbing increasing amounts of atmospheric CO2, that most pernicious of greenhouse gases.  Waterston, who is on the board of Oceana, was just testifying in DC about it, as Weaver was recently.

Oh, and if you thought this post was going another direction, here you go:

Sam Waterston was in 1976's Sweet Revenge with Norman Matlock who was in 1984's Ghostbusters with Sigourney Weaver.

There you go Kevin Bacon, you're not so special after all, anyone can do it...