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ECOLOGICAL FOOTPRINT
  The Ecological Footprint has emerged as the world’s premier measure of humanity’s demand on nature. It measures how much land and water area a human population requires to produce the resource it consumes and to absorb its wastes, using prevailing technology.  
Each week we make many purchasing decisions - from groceries, clothes and books, to appliances, cars, plane trips and public transport, and more. The impact of all these decisions is measured by what is called the ecological footprint.
If you think your one contribution is insignificant, remember these words from environmentalist David Suzuki: "Every single one of us is insignificant. But if you have hundreds of thousands of insignificant people, that adds up."