'A footprint means pressing down and global means world, so 'global footprint' means pressing down on the world and we don't want to press too hard' (child's definition of a Global Footprint)
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what about climate change?

Environmental refugees

People forced to leave their homes because of environmental factors are considered a new type of refugee.

Some reports predict that rising sea levels, desertification, soil erosion and shrinking freshwater supplies – all made worse by climate change – could create up to 50 million environmental refugees within the next 10 years. Yet environmental refugees are currently not recognised under the UN Convention on Refugees or any other international agreements.
This is despite the fact that the Red Cross say more people are now displaced by environmental disasters than by war. Furthermore, some argue that the homes of these displaced people are being destroyed because of the environmental and economic policies of the governments of developed countries and that it amounts to “environmental persecution,” making environmental refugees deserving of legal protection.
Environment-related migration has been most notable in sub-Saharan Africa, but also affects millions of people in Asia and India. Europe and the US face increased pressure from people driven from North Africa and Latin America by deteriorating soil and water conditions.
Half of all refugees come from just three countries: Palestine, Afghanistan and Iraq. Other countries in the top 10 sources of refugees are Sierra Leone, Somalia, Sudan, Yugoslavia, Angola, Croatia, and Eritrea.

The top five countries that host refugees are: Pakistan (1.1 million), Iran (985,000), Germany (960,000), Tanzania (650,000) and the United States (452,500). (2004 figures)