Characteristics of WBGU exemplary path Increased energy productivity Factor 3 by 2050 (1.6% increase) Phase out of non sustainable energy sources Fossil fuels: long term phase out necessary Nuclear energy: phase out by 2050 Phase in of renewable energy: 20% by 2020, 50% by 2050, 85% by 2100 Solar energy: fast increase(tenfold growth per decade) Wind energy: fast increase(tenfold growth per decade until 2020) Biomass: Conservative assessment of sustainable potential (100 EJ/a) Hydro, Geothermal: Conservative assessment (15 EJ/a, 20 EJ/a) CO 2 sequestration necessary 200 Gt storage total (transition technology), use of depleted oil and gas fields Biomass + sequestration (negative emissions)
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