This Halifax Project task force is focused on "Assessing the Carcinogenic Potential of Low Dose Exposures to Chemical Mixtures in the Environment". More than 100 participating scientists from around the globe are being formed into 12 teams (see below) that will be focused on the possibility that complex mixtures of commonly encountered chemicals in the environment may be capable of carcinogenic effects that have yet to be fully appreciated. We believe that the historical scientific and regulatory emphasis on “mutagens as carcinogens” and the ongoing search for individual chemicals and precisely defined mixtures that are “complete” carcinogens (i.e., can cause cancer on their own) is an incomplete approach that has serious limitations. The last few decades have shown us that cancer can be enabled by a series of key events, while chemical exposure research has shown us that many of these key events can be independently instigated. At the same time, we have discovered that many chemicals have low dose effects that have not been fully appreciated. So this task force is studying the possibility that exposures to mixtures of disruptive chemicals at low doses (in our day-to-day lives) may be contributing to the high rates of cancer incidence that society is currently facing. We believe that a better understanding of this issue is critically important for cancer prevention.