|Richard Daniel chairs the interactive environmental programme in which he and his guests deal with listener's questions and concerns.|
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Home Planet, PO Box 3096, Brighton BN1 1PL
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|"Home Planet is the environmental programme for which you set the agenda. We tackle your questions and concerns and try and make some sense out of the conflicting opinions which make up the environmental debate."|
Dr Ros Taylor
Principal Lecturer in Earth Science and Geography, Kingston University
Derek Moore OBE
Wild Life Trusts
Professor Philip Stott
Bio-geographer, University of London
The Kariba Dam
World Commission on Dams
What lies behind the recent rise in numbers?
British Trust for Ornithology - Bird Trends 2004
What does a tonne of C02 look like?
Visualizing measures of weight (eg in kg) as volumes (eg in L) is often difficult, although we can use vernacular images such as a "sack of potatoes" or a "sack of coal." It is even more difficult when we are thinking of a gas, such as carbon dioxide, not in its solid or liquid state.
22.4L of any ideal gas at standard temperature and pressure (STP) contains Avogadro's number of 6.022 x 10^23 molecules. The quantity of anything that has the same number of particles is called a mole (mol). But the weight of the gas will vary in proportion to the sum of the atomic weights that comprise the molecules of the gas.
1 mol of carbon dioxide @ STP = 22.4 L (ie volume)
1 mol of carbon dioxide = 44.0098 g (ie weight)
1 kg of carbon dioxide = 22.73 mol
Thus, the volume of 1 kg of carbon dioxide will be:
22.4 L/mol x 22.73 mol = 509 L
But what would this look like?
A standard wine bottle is 0.75 L
1 kg of carbon dioxide = 679 bottles of wine
1 t of carbon dioxide = 679,000 bottles, or 56,583 cases. Some party!
In stark contrast, 1 kg of solid carbon dioxide ("dry ice") at a density of 1.56 g/cm^3 and at minus 79º Celsius = a tiny block about 8.6 cm on each edge.
What is the difference between a ton and a tonne?
(i) "Tonne" (t) is a metric measure of weight in the Metric System of Measurements. It is equal to 1,000 kg or 1,000,000 g;
(ii) "Ton" (tn or T) comes in two different measures of weight, namely the "long ton" and the "short ton". The "long ton" is the old UK Imperial measure of 2,240 lb = 1.016 t. The "short ton" is used in the US and Canada and is a measure of 2,000 lb = 0.907 t. However, the "long ton" is employed in the US for the displacement of ships.
Carbon dioxide emissions from animals
The panel discussed the impact of carbon dioxide from animals and explained how, as they were part of the so-called "closed loop" they had less impact than emissions from cars.
The carbon cycle described by the UK Met Office
The Royal Society of Chemistry provide teacher's notes
Wildlife & Wetland Trust
International Council for Science
BBC bitesize GCSE revision
Culling of kangaroos
Australian Government Department of the Environment and Heritage
Department of Environment and Conservation in New South Wales
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