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2. Global oil outlook: Return to the absence of surplus and its implications;Salameh;Applied Energy,2000
3. Greenhouse gas emissions from Swiss agriculture since 1990: Implications for environmental policies to mitigate global warming;Leifeld;Energy policy,2005
4. Its time to tax global warming;Lazare;The Electricity Journal,2001
5. The hydrogen economy in the 21st century;Barreto;International Journal of Hydrogen Energy,2003