Hillary Rodham Clinton, New York’s Democratic Senate candidate, yesterday attacked the environmental record of her Republican opponent, Rick Lazio, and talked up her own green convictions. On a campaign tour of Long Island, Clinton touched on everything from drinking water quality to suburban sprawl, from high breast-cancer rates in the area to dying lobsters in Long Island Sound. “A livable Long Island must be an environmentally sound Long Island,” she said. Lazio responded by saying, “If she ever lived on Long Island, she would have some basis to talk about a livability plan.” Clinton may have a hard time painting Lazio as weak on the environment; he was endorsed by the Sierra Club and the League of Conservation Voters in past congressional races.