BIOREMEDIATION

Bioremediation does require for the DNA in the bacteria to be genetically altered so as to be able to properly clean the contamination.  This imposes ethical issues among many, because some believe that since the process of altering the DNA genetically, it would upset the natural enviroment the bacteria are introduced to, as the process is not a naturally occuring one.   

 

Though the fact that the microbes are genetically altered to better rid soil or water of contamination, it is highly improbable that the microbes will spread the contamination anywhere.  The microbes grow as they eat the waste or pollutants, and when they have cleaned up the contaminates in the soil or water they they tend to die off.