In order to calculate the number of organisations that have been certified with ISO 14001 in the EU15 countries, the raw values for each EU15 country for each year are added up. The number of organisations for the EU12 countries is calculated in a similar manner.
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Let the grass grow higher and thus encourage root growth. It will also allow the grass to self-seed. If you mow a path in the middle, it will show that it is indeed meant to be that way as opposed to being neglected.
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