ECOLOGICAL FOOTPRINT. What exactly is an ecological footprint?

of 26 /26

Embed Size (px)

Transcript of ECOLOGICAL FOOTPRINT. What exactly is an ecological footprint?


  • What exactly is an ecological footprint?

  • Definition: ecological footprint The amount of land needed to produce all of the things we use to support our lifestyle and to absorb all of the waste we create

  • What exactly is an ecological footprint?It is the IMPRINT we leave on the Earth when we use land for:

  • What would beincluded in your ecologicalfootprint?


  • Its All From NatureEVERYTHING we use comes from, and is returned to nature

  • NATURE?bauxite orecaustic sodamagnesiummanganeseironsiliconcopper

  • NATURE?cottonpesticideschemical dyespetroleumcopper, zinciron, carbon

  • Its All From NatureEVERYTHING we use comes from, and is returned to nature

    but how much can the Earth handle?

  • So, how much land is there??Earth51 billion hectares

  • What is a hectare (ha)?Unit of measurementCommonly used for measuring land100m x 100m2.47 acresApproximately one official soccer field

  • Earth51 billion hectares



  • Lets Do the Math51 billion hectaresLAND:18% of that is productive landHow many hectares of productive land?WATER:5% of that is productive waterHow many hectares of productive water?

  • Not a whole lot of room!There are over 7 BILLION PEOPLE who live on the Earth

    That means theres only 1.7 hectares available for each of us!!

  • Not all footprints are the sameEvery lifestyle has a different footprint, and on average, so does every country

    Available 1.7 ha Canada 8.8 haIndia0.5 haUnited States 10 ha

  • In Canada, our footprint is

    That means we are using more land than is available to sustain our lifestyles8.8 hectaresper person

  • CanadaWhat if everyone lived as we do?

  • Extra Slides

  • The planet mapped by footprint size

  • no car no water (need to walk to well) no electricity live off the land no car no electricity markets for food well for water two cars 45 lights and 3 TVs heated swimming pool grocery stores two plane trips a year weekly garbage pickupEvery lifestyle has a different footprint

    Discuss how this imprint is so much bigger than simply imagining this talk about glass dome**Use the glass dome as a metaphor for 'the amount of land we need' to support our lifestyles. How big would the glass dome need to be to meet our needs? Do all of our foods, raw materials, etc. come from the area under the dome, or do we bring some things into our community/city from outside? If the glass dome covered the farmers fields, the mines, the factories, the waterways, the landfills that support my needs, what area of land would that dome cover?**Waste is not just garbage but ultimately everything we use, once it comes to the end of its useful life***Bauxiteis analuminiumoreand is the main source of aluminium. This form of rock consists mostly of themineralsgibbsiteAl(OH)3,boehmite-AlO(OH), anddiaspore-AlO(OH), in amixturewith the twoiron oxides. Bauxite was named after the villageLes Bauxin southernFrance. In its mineral form Bauxite, Aluminum is the most abundant metal in the earth's crust.Sodium hydroxide, also known as lye orcaustic soda, has the molecular formula NaOH and is a highly caustic metallic base.

    *Chemical dyes = synthetic indigo; petroleum for some types of thread (polyester); copper + zinc = brass, for rivets; iron + carbon = steel, for zippers, snaps and buttons******Only 18% of the Earths surface is productive- can be used to grow things, extract resources from, etc.11% of it is non-productive from a human perspective to meet our needsSkip this slide for the lower gradesHow many hectares of productive land? 51 x 18% = 9.18ha billion hectares of productive landAdd to that about 2.82 billion ha of productive water (approximately 4% of the surface of the earth thats covered in water) = 2.55 billion hectares of productive waterNote on Productive water: The deep ocean is not part of the productive part that we fish from. The majority of fishing happens in just the shallower parts of the ocean. many ha of productive land and water? 12 billion

    Total: 11.73- round up to 12 billion hectares

    ** So 12 billion productive hectares for 7 billion people= 1.7 ha/person

    *The numbers here reflect average footprint per person, of Canada, India, and the US.The Available Ecofootprint of 1.7 hectares is also known as the Fair Earthshare. This is defined as the amount of ecologically productive land available per person on the planet. This does not rake into account the needs of other species. (Imagine how much smaller the footprint would be if we looked at that!) ****