what was the link between " Population, Health & Environment"?

Answer 1

If the population is exposed to sources of pollution (lets say groundwater with Trichloroethylene in concentrations over 5 parts per billion), then the population is exposed to a potential health risk.

Not everybody will respond to the exposure the same. Many will not be affected at all. Some may contract rare forms of cancer in rates that would exceed the normal rates of contracting cancer (this is what is considered to be a cancer cluster).

Now, the question is: How many of these people would have gotten cancer anyway? If all of them, then there is not an adverse health affect from the exposure to TCE. But if 4% get it, then they were adversely affected by the TCE.

EPA has come up with what they call Reference Doses - the amount of chemical you can consume (by eating contaminated soil, drinking contaminated water, or breathing contaminated air). They are the standards environmental consultants use for establishing what levels of soil, water, air pollutants are clean or not.

(as much as I hate to cite wikipedia, I will because the EPA site is the regulation and not an explanation:

http://en.wikipedia.org/wiki/Reference_dose

Answer 2

Natures Law of Harmony or Equilibrium,

in Nature everybody is welcome ,but nothing is permitted to live in excess.
if it happens it is considered a plague
and nature responds with diseases or preditors

there has to be an equilibrium to have harmony

then life is healthy and peace full

ancient civilizations knew this ,and so do primative tribes in the Amazon
they carefully limit their numbers in various manners ,the Olmecs women are Yams to control their birth rate ,
the Aztec sacrified the excess children to the gods
the tribes in the Amazon have strange sexual rite that are only a few times a year .

the environment of any specie can only supply so much food for that specie.

foxes have more cubs when there is an excess of rabbits
and when there is little they only have a couple
wild dogs do the same ,Lions ,hyenas ,tigers ,bears etc.
and many more species do as well

there are two times in a species existance when the danger of extinction is the greatest ,when there are too little and when there are too much ,because sometimes Natures balancing forces do not have brakes ,and the disease or predoitor ,send to restore the balance can wipe some specie out.

We Humans tend to forget that we belong to the same system and are subject to the same laws

and now we see Natural disasters ,diseases,wars earthquakes ,tsunamis,global warming etc ,and maybe this is Nature trying to pull us down a peg or two.

world`population has doubled in the last 50 years
each year farmers have to grow food for 70 million more people ,and the strain is beginning to show

our fresh water suppplies are running low
agriculture is overpumping deep carbon aquifiers,which do not fill up again and so causing sometimes sinkholes that are miles deep

and after the irrigation runs out ,a dessert is the result
grass lands are overgrazed also becoming desserts ,farmers now turn to highly erodable lands to try and meet the increasing demands of the market.
expanding populations deforrest lands for habitation and farming
tar roads and concrete are being exchanged for bio mass ,

which we need to capture carbon ,leave us oxigen ,produce rain ,keep the rivers running and control temperature globally ,
forrests absorb the heat of the day and heat up the cold nights and stop us from freezing,when they release the heat.

looking from space we must seem like a plague that is spreading over the planet
and something has gotta give

polpulation growth now ,is directly relevant to our overall health and the health of the Environment
and maybe the survival of our specie