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CO2 emissions from aviation (domestic and international) in the EU-15 have grown by 62 % between 1990 and 2003. For international aviation, the growth in CO2 emissions over this period is even higher (73 %) (this is also mentioned in EC, 2005g).
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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