With population a key influence on the environment, UNFPA says the 1994 Cairo conference on population and development linked environmental protection to individual decision-making and human rights.

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Muddying up even that potentially clear picture, though, is the influence of environment on the ultimate outcome of having any gene variant.

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Traditional methods of estimating the influence of genes and the environment on intelligence have largely been limited to comparisons between people who are related, such as identical or fraternal twins.

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"It looks like an extremely cheap attempt by ExxonMobil to buy a shield from criticism, " said Peter Altman, national coordinator of Campaign ExxonMobil, a US shareholder group trying to influence the company's positions on the environment.

BBC: Sky,

For example, work in the field of epigenetics demonstrates that environment can have a profound influence on how DNA impacts biology.

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Locally, parents can work to massage the culture of a school, and in the city's school-choice environment, they can have more of an ultimate influence on their child's education than in many other cities.

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So, yes, it became a big influence on town planning and the American imagination of what it's like to live in a small environment.

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