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http://www.hm-treasury.gov.uk/independent_reviews/stern_review_economics_climate_change/stern_review_report.cfm” Using the results from formal economic models, the Review estimates that if we don’t
act, the overall costs and risks of climate change will be equivalent to losing at least
5% of global GDP each year, now and forever. If a wider range of risks and impacts
is taken into account, the estimates of damage could rise to 20% of GDP or more.
In contrast, the costs of action – reducing greenhouse gas emissions to avoid the
worst impacts of climate change – can be limited to around 1% of global GDP each
year”.