| 21. | The index is weighted to give progressively higher scores to nations with lower ecological footprints.
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| 22. | The Craik Sustainable Living Project strives to motivate local people to reduce their ecological footprint.
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| 23. | The greenhouse debt assessment thus forms an ecological footprint analysis but can be used separately.
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| 24. | Ecological footprint analysis is widely applied around the Earth as an indicator of environmental sustainability.
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| 25. | This is why the use of recycled material leads to a significant better ecological footprint.
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| 26. | One way of describing the impact of a city is to measure its ecological footprint.
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| 27. | Later, the idea of " ecological footprint " developed.
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| 28. | In 1992, William Rees developed the ecological footprint concept.
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| 29. | It covered topics such as ecological footprints, sleep deprivation, gravity and the science of laughter.
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| 30. | Oakland, Calif ., that advocates for environmental sustainability and wrote the Ecological Footprint Quiz .)
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