Comenius

PROGRAMME

Tartalomjegyzék
Karbon lábnyom
2. oldal
3. oldal
Minden oldal

Karbon lábnyom

Az elemi szén kulcsfontosságú szerepet játszik a Föld bioszisztémájában, mint szén dioxid, jelen van a biomasszában. és jelen van, mint nyersanyag amiből égés során energia vagy elektromos áram képződik.Mivel a Szén-dioxid könnyebb, mint a levegő, ezért felemlekdik és felhalmozódik a felsőbb légkörökben. Mivel a CO2 elnyeli a Föld felszínéről visszaverőd9tt hő egy részét, ezért hozzájárul a globális légkör felmelegedéséhez.

A karbon lábnyom egy eszköz a szén dioxid kibocsátás számolására és megmutatja azt is, hogy egy nap mennyi energiát használunk fel.

Amit mindannziaunknak meg kellene tennie az a saját karbon lábnyomunk kiszámolása, utána pedig meghatározni, hogyan tudnánk csökkenteni a lábnyomunk, azért hogy megvédhessük a klímánkat.

Feladatok

  • Összegyűjteni az internetről egy vagy több módját a karbon lábnyom kiszámolásának
  • Értékelni a saját karbon lábnyomunkat egy tipikus napi atevékenységek során, a felkeléstől egészen a lefekvésig
  • Be kell vonni a család többi tagját is tevékenységekre bontva mint a fűtés, vagy hűtés 9ssze kell gyújteni a család összes olyan tevékynségét amihez energiát használ fel
  • Összehasonlítani a karbon lábnyomot két különböző számítás szerint is elvégezve, megnézve, hogy van-e különbség?
  • Összehasonlítani a karbon lábnyomot a csapat többi tagjával-kinek van a legnagyobb, kinek a legkisebb és ennek mi lehet az oka?
  • Megosztani az eredményeket más országok iskoláinak partnerosztályaival.

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The presence of greenhouse gases in the earth’s stratosphere results in some of the heat radiated by the earth being reflected back to the earth’s surface rather than transmitted to outer space as shown in the ray diagram below.



Ray diagram of solar energy flows showing effect of greenhouse gases

Methane has a much stronger warming impact than carbon dioxide though a much shorter half life. It is the main constituent of natural gas, one of our main fossil fuels, which is widely used for space and water heating and increasingly for generating electricity. When burnt, methane combines with oxygen to form carbon dioxide and water vapour, which is also a greenhouse gas.

Nitrous oxides also have a much stronger warming impact than carbon dioxide and are released naturally by bacteria, digestion of ruminant animals like cows and in the combustion of fossil fuels.

Fluorinated gases have the highest warming impact and are a family of synthetic chemicals primarily used as refrigerants for air conditioners and in refridgerators. These chemicals are being phased out by international agreement and are being replaced by naturally occurring compounds with low global impact warming and low ozone depletion potential. These compounds include hydrocarbons like butane, ammonia and carbon dioxide. So paradoxically carbon dioxide has beneficial as well as adverse environmental properties.

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The other two greenhouse gases present naturally are water vapour (as noted above) and ozone.

Water vapour is created by evaporation from the seas and sources on land like lakes and rivers. Global warming will accelerate the rate of evaporation which will impact the earth’s water cycle and could increase global warming further.

Ozone is an unstable form (isotope) of oxygen and exists naturally in the upper atmosphere. Apart from its ability as a greenhouse gas to absorb the earth’s radiation, more importantly it protects living species by absorbing the ultraviolet portion of sunlight falling on the earth’s surface. As ozone is broken down by fluorinated gases, gaps have appeared in the ozone layer and so the global intention is to phase out all fluorinated gases as set out the Montreal convention (1987) on ozone depletion. Ozone can be created by the reaction between sunlight and ground level pollution so the there can be an excess of ozone if the level of pollution is high. Whilst ozone itself is a greenhouse gas, it can react with other greenhouse gases to shorten their lifespan.

The challenge of reducing our footprint
One of the network’s main goals is to initiate local actions which will reduce our carbon footprint individually and collectively.

In order to assess how we might do this, each of us needs to calculate our carbon footprint when your class (or school) joins the network and then to compare your footprint with those of others in your group and to consider how these differ and why.

By linking with another class in another country, you will then be able compare the footprints of eachr group. Each class can then challenge the other to discuss and agree how each class might be able to reduce your footprint over the next 2 years by say 10% reduction.

If you think that this might be difficult remember that a sustainable carbon footprint will likely require each of us in Europe over the next 40 years to reduce our footprint by up to 80%.

[link to CwC activity #2]

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