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Figure 16 Renewable energy supply, index Module
4
Renewable energy index (1900=100)
240 Biofuels
220
Hydro
200
Geothermal Abu Dhabi, UAE
180
Solar
160
Wind
120
100
0
1990 1992 1994 1996 1999 2000 2002 2004
Year
UNEP Global Environmental Outlook, 2006
Another example is the use of appropriate scales on the X and Y-axis. For example, the following two
fictive graphs created for this Module (Figures 17 and 18) can give quite different impressions. At a
glance, one could easily say that Figure 16 does not show a trend at all, while Figure 17 presents a stable
situation. However, they are derived from the very same data and only differ in the Y-axis scale.
Figure 17 Graph Showing Erratic Pattern
20 Phosphous concentration (ug/1)
15
10
1966 1988 1990 1992 1994 1996 1998 2000 2002
Year
IEA Training Manual Workshop for the National Reporting Toolkit (NRT) 77
