Also, separating out cause and effect can be difficult. It appears that they are assuming that an increase in cancer in the vicinity of a power line means that the fields around the power line caused the cancer. An alternative possibility is that real estate that close to a power line is undesireable, and therefore tends to host high-density, low-income housing. There are two problems with that: Low-income housing may tend to host populations that have habbits or backgrounds that tend to encourage cancer, and high density will of course produce a larger number of cases if the density is not accounted for.
[This message has been edited by SolarPowered (edited 10-29-2004).]
