This is something that we should be afraid off, we are jeopardizing our youth! – Aleks

Environment and intelligence research investigates the impact of environment on intelligence. This is one of the most important factors in understanding human group differences in IQ test scores and other measures of cognitive ability. It is estimated that genes contribute about 20–40% of the variance in intelligence in childhood and about 80% in old age. Thus the environment and its interaction with genes account for a high proportion of the variation in intelligence seen in groups of young children, and for a small proportion of the variation observed in groups of mature adults. Historically, there has been great interest in the field of intelligence research to determine environmental influences on the development of cognitive functioning, in particular, fluid intelligence, as defined by its stabilization at 16 years of age. Despite the fact that intelligence stabilizes in early adulthood it is thought that genetic factors come to play more of a role in our intelligence during middle and old age and that the importance of the environment dissipates.
[Link on Wikipedia with extensive number of resources =>]

The intelligence of the younger generations falls, about two points every ten years, and it is not the dysgenics or the migrants who are to blame, but this decline is observed in every average family. The only remaining explanation is that there is something in the middle of modern society that is keeping children from developing.

The World Health Organization (WHO) has another simpler and creepier explanation: the rise in air pollution. Air pollution is global today, and it is estimated that the rise of microparticles in the air affects the health of as many as 90% of the world’s population.

Global pollution could be responsible for slowing down and stopping youth development. Unless we do something urgent, the question is what kind of world we will leave to our children, but also what kind of children we will leave to that world.
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Possible end of progression

Mean standing height and mean GA (both in z scores units+5) by year of testing, from Jon Martin Sundet and colleagues (2004) examined scores on intelligence tests given to Norwegian conscripts between the 1950s and 2002. They found that the increase of scores of general intelligence stopped after the mid-1990s and declined in numerical reasoning sub-tests. [Link =>]

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Lead poisoning and health
Health effects of lead poisoning on children

Lead exposure can have serious consequences for the health of children. At high levels of exposure, lead attacks the brain and central nervous system to cause coma, convulsions and even death. Children who survive severe lead poisoning may be left with mental retardation and behavioural disorders. In particular lead can affect children’s brain development resulting in reduced intelligence quotient (IQ). [Link =>]

AIR POLLUTION LEVELS RISING IN MANY OF THE WORLD’S POOREST CITIES [Link =>]

Pertussis vaccines: WHO position paper – most recent developments in the eld of pertussis disease and its prevention by vaccination. [Link =>]

Organophosphate Insecticide Metabolites in Prenatal and Childhood Urine Samples and Intelligence Scores at 6 Years of Age. [Link =>]