David McCallister - head On this, the 100th day since the worst U.S. environmental catastrophe began, we meet a finalist in the government’s search for a service that can best safely remove oil residue from Gulf state beaches. David McCallister is co-principal in a company called Environmental Solutions, that has developed a biodegradable, non-toxic clear substance that can be sprayed onto shores and easily removed, taking oil with it, without harm to marine life or humans. This is a Green Front exclusive as David’s company awaits final word in a bidding process which included some 3,600  applicants!