Highly populated areas also get more money from the federal government.

VOA: special.2010.05.07

Even in highly populated urban areas, there are elderly-rich communities where members are living alone and suffering from a lack of social interaction.

FORBES: Social Interaction Study Highlights Loneliness and Isolation as Heath Risks for Elders

Mangrove forests have lost 30 to 50 per cent of their original cover in the last 50 years while coral reefs have lost 20 per cent, increasing the vulnerability of many highly populated coastal areas.

UNESCO: OFFICE IN BRASILIA

These were chosen to minimise the confusing effects of background pollution that might be found in more densely populated and highly industrialised areas.

ECONOMIST: Weather and pollution