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Greenhouse debt or carbon debt is the measure to which an individual person, incorporated association, business enterprise, government instrumentality or geographic community exceeds its permitted greenhouse footprint and contributes greenhouse gases that contribute to global warming and climate change.
Friends of the Earth and similar organisations put forward the concept to define specifically the environmental harm caused by developed countries' past and present policies. Some governments, at least the Australian Labor leadership, have a tendency to accept such a line of reasoning.
The greenhouse debt assessment thus forms an ecological footprint analysis, but can be used separately. Taken conjointly with a 'water debt' analysis and an ecological impact assessment, greenhouse debt analysis is basic to giving individuals, organisations, governments and communities an understanding of the effects they are having on Gaia, life, global warming.
Ensuring that the greenhouse debt is zero is essential towards achieving Ecologically Sustainable Development or a sustainable retreat. Any greenhouse debt incurred will contribute to making life harder for the future generations of humans and non-human lifeforms to come.
There are three possible consequences that occur as a result of a greenhouse debt. They are either:
- Mitigation: finding compensatory ways of reducing the greenhouse debt so its effects are neutralised
- Adaptation: finding ways of adjusting to the resulting global warming or climate change
- Suffering: having one's quality of life reduced as a result of the consequences.
See also 
- Friends of the Earth International. 2000. "Greenhouse debt". Link (20): http://www.foei.org/en/publications/link/92/e92greenhouse_debt.html
- Clive Hamilton, "We will all pay for Howard's hidden greenhouse debt", Crikey, Friday, 14 December 2007: http://www.crikey.com.au/Politics/20071214-Howards-Hidden-Greenhouse-Debt-.html?CurrentDate=14+%2F+01+%2F+2008.