If you’ve looked out over the water off the coast of Stamford and seen an old-timey, green three-masted schooner, you may have seen the future of Long Island Sound sail past. The schooner SoundWaters, based in the city, brings thousands of school children to local coastal waters each year, teaching them about the ecology and delicate environmental balance of the Sound, with the hope of preserving what might be the area’s most precious natural resource.