The carrying capacity of a country is the number of people it can sustain long term in terms of essential needs-food, water, shelter. A country has to either be self sufficient for food and raw materials or export something-goods or services which the rest of the world wants and will pay for

Climate change directly threatens  carrying capacity-less land, desertification, rising sea-levels, more expensive environmental protection e.g. levees, sea walls, housing stock.

When the carrying capacity of a country, a city, a community is reached the inevitable consequences are

1.Migration

2.Fighting for scarce resources

3.Increased numbers of people dying before their time

Rwanda 1994…………….the ruins of bygone civilisations from Easter Island to the Aztecs