The solid lines are based on observations smoothed to remove the effects of interannual variability (light lines connect data points). Data in most recent years are obtained via satellite based sensors. The envelope of IPCC (2001) projections is shown for comparison; this includes the broken lines as individual projections and the shading as the uncertainty around the projections.
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The production of butter, cheese and other dairy products with high fat content accounts for high greenhouse gas emissions as well as for eutrophication of groundwater, rivers and seas. Remember: Globally, around 70 % of all agricultural land is used for livestock production.
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