『Introduction
　This appendix compares the WETO Reference hypotheses and results with the projections provided by other world energy studies. Three institutions carry out forecasts whose scope is comparable to WETO:

• The International Energy Agency (IEA) also produces a world energy outlook to 2020. Insofar as the 2001 report has been dedicated to energy supply issues, based on the projections of the World Energy Outlook 2000, we use this IEA 2000 Reference Scenario for comparison.
• IIASA has developed for the World Energy Council a set of scenario projections to the year 2100. For this comparison, we use the WEC 1998-A2 scenario, which assumes an oil and gas resource availability that is comparable to the one used in the WETO Reference.
• The Energy Information Administration of the U.S. Department of Energy provides yearly updated energy forecasts to 2020 in its International Energy Outlook. For this comparison we used the US-DOE 2002 Reference Case projection.

The four studies compared here use database and conversion factors that may slightly differ from one model to the other. In order to reduce the resulting discrepancies and to improve the comparability of results, all data have been harmonised while applying the growth rates derived from each study to the initial 2000 values of the WETO study. This allows having a clearer view and a better understanding of the common outcomes and divergences between the studies.』

1. World population
2. World GDP
3. World oil price
4. World energy consumption
5. World CO2 emission
6. World coal demand
7. World oil demand
8. World gas demand
9. World nuclear electricity production
10. World hydro-electricity production
11. World biomass production
12. World other renewable production

『4. World energy consumption
World total energy consumption levels, as they stem from the harmonisation process used here, show similar levels for the time-period considered, with a typical 12 Gtoe in 2010 and 14.5 in 2020 (only one study displays a significantly higher value, i.e. 15.5 Gtoe for that date) and 17 Gtoe in 2030. However, this proximity in total energy forecasts hides more important differences in the projections for individual energy sources, as analysed below.』

『7. World oil demand
World oil demand exceeds 4 Gtoe in 2010 in the four studies, and 5 Gtoe in 2020 in three of them. The corresponding growth rates are however at a relatively low level, between 1.5 and 2 %/year. The DOE forecast shows the highest level of world oil demand in 2020 and this is consistent, on the demand side, with the fact that this study also has the lowest oil price for that horizon (23 $/bl).』