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chapter 4

REPORTING TRENDS OVER TIME

be published so that users can calculate their own ratios.

Trend data is important so that changes in performance over time or compared to a reference point can be assessed. Data can be presented as absolute value and environmental influence figures or as eco-efficiency ratios, or indexed to a selected year, or expressed relative to a projected goal. The performance could also be expressed relative to an industry average, if that is available. If indices are used, however, the absolute numbers underlying them should also

A report could therefore include data from several years, as well as a r eference year and targets in order to illustrate improvements over time and demonstrate achievements against targets, as shown in the example below.

It is crucial, however, that data presented in such charts is truly comparable so that the trends depicted accurately represent eco-efficiency performance.

“ Strong emphasis should be placed on the use of trends or comparisons over periods of time with the eco-ef ficiency calculations. When they stand alone, these indicators have little meaning in comparison to the environmental impact they represent.”

EVALUATION OF THE CONCEPT BY PILOT COMPANIES, MARCH 2000

600

500

400

300

200

100

0

90

performance over time

Net Sales in mil USD

470

540

92

8

6

4

2

134

94

10

0

190

96

60

Energy Consumption in terajoules

0

5.0

7.0

5.8

90

236

98

50

40

90

6.3

92

323

391

99

TARGET

2002

40

44

50

51

92

GHG Emissions

in kilotons CO2 equivalent

94

32

94

7.2

96

24

96

8.1

7.5

98

30

20

20

98

99

TARGET

2002

99

TARGET

2002

eco-efficiency ratios

Mass of Product per Greenhouse Gas Emissions

Net Sales per Greenhouse Gas Emissions

(in kg per ton CO2 equivalent)

(in 1000 USD per ton CO2 equivalent)

100

100

93

80

80

60

40

36

46

48

47

43

55

60

40

27

40

52

66

67

reference 1990 1996 1998 target 1999 1999 target 2002

20

20

0

0

90

96

98

99

99

02

90

96

98

99

99

02

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