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5.1 Historical warming of the earth.
5.1.1Causes.
5.2 Greenhouse
gases in the atmosphere.
5.3 Solar
variation theory.
5.4 Expected effects.
5.4.1 Spread of disease.
5.4.2 Financial
effects.
5.4.3 Biomass
production.
5.5 Opening up of the Northwest Passage in summer.
5.6 Dangerous global warming.
5.6.1 Ocean acidification.
5.6.2 Relationship
to global dimming.
5.7 Pre-human
global warming.
5.8 Pre-industrial global warming.
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