NOVELTY - Reducing contaminants in an environment comprising using a delivery system comprises distributing to a contaminated environment a recombinant Bacillus family member expressing a fusion construct, where the fusion construct comprises at least one molecule of interest (MOI) and at least one positioning sequence encoding a Bacillus exosporium protein, where the MOI is physically attached to the exosporium of the recombinant Bacillus family member.    USE - The methods and delivery system are used for reducing contaminants in an environment; and for producing an energy source. The contaminated environment is contaminated with a contaminate selected from atrazine (preferred), mercury, chromium VI, and their combination. The energy source is selected from biofuel, biodiesel, and biohydrogen (all claimed). The delivery system is also useful in vaccine therapeutics, in biosensor technology, in biocatalyst technology, as biofilters, in fuel cells, and in other fields of use. The vaccine is used for treating and preventing diseases caused by bacteria, virus and parasites.    ADVANTAGE - The present invention provides B. exosporium molecule delivery (BEMD) system that provides a means to deliver MOIs to an environment. The system results in the display of MOIs on the exosporium surface of Bacillus family members such that they can be delivered to an environment in a stable and active form. The BEMD system has implications for the development of potentially better and safer vaccines.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are: (1) a contaminate reduction composition comprising a recombinant Bacillus family member expressing a fusion construct, where the fusion construct comprises at least one enzyme and a positioning sequence encoding about the first 50 amino acid residues of the N-terminal domain (NTD) of a B. exosporium protein; and (2) a method of producing an energy source comprising a delivery system by distributing to a biomass material a recombinant Bacillus family member expressing a fusion construct, where the fusion construct comprises at least one MOI and at least one positioning sequence encoding a B. exosporium protein, where the MOI is physically attached to the exosporium of the recombinant Bacillus family member.