"A genetically modified pig, nicknamed the “enviropig,” has the ability to produce a bacterial enzyme in its saliva that helps reduce the amount of phosphorus in its wastes. Phosphorus pollution is a serious environmental concern. Enviropigs are expensive, but the cost is balanced against the benefit to the environment. There is also a concern that the US Department of Agriculture still has not cleared enviropig meat for human consumption.

Government agencies and citizens should propose the use of enviropig in the future only after
(1)developing ways to remove the bacterial enzyme
(2)assessing risks, costs, and benefits
(3)people have eaten lots of enviropig meat and determined the effects
(4)a different, cheaper pig can be produced regardless of the output of phosphorus"