Extension questions

a) i) Plan one is only testing at ONE point
ii) By having 4 sites there are more results taken meaning it is easier to identify anomalous results, and by asking the weight of the cardboard it is easier to record/measure with reliable and standard parameters ie. kg
iii) Whereas in Plan two it is possible, and very likely, that each collector will only know an estimate of the weight of their cardboard if the students measured the cardboard and plastic themselves their results would be more accurate

Burning Sugar Cane

Because the farmer only burns the dry parts of the plant which contains a little sugar, the carbon dioxide released is not much (as there is only a little bit of sugar that is combusted) and can easily be absorbed into the surrounding trees through the process of photosynthesis, therefore not affecting the atmosphere on any scale.

Causes of Atmospheric Pollution

Unit 3.2: page 125 in the Textbook

Carbon Dioxide: http://www.epa.gov/climatechange/emissions/co2_human.html

Sources:

1. Deforestation and burning wood

2. Burning fossil fuels

Effects: 

1. Traps more of the heat radiated from the surface

2. Increases Earth's atmosphere, causing Global Warming

3. Rising sea levels

4. Changes in world weather

Page 132: CFCs http://www.pollutionissues.com/Br-Co/CFCs-Chlorofluorocarbons.html

Sources: 

1. Propellants in aerosol spray cans - hair spray, deodorants, insect killers

2. Coolants used in refirgerators and air-conditioning systems

Effects:1. Persist in the atmospehre for a long time, causing the breakdown of the Ozone System (hole in the ozone layer over Antartica)

Page 135: Methane http://epa.gov/methane/sources.html

Sources:

1. Deforestation

2. Decomposition of waste

3. Rice and cattle farming (rotting vegetation)

Effects:

1. Contributes to Greenhouse gases, leading to:

Rising sea levels, changes in world weather and global warming