June 2013
Intermediate to advanced
448 pages
16h 23m
English
Dollars ($) are US dollars throughout unless stated otherwise. The year to which costs and prices refer varies depending on the source: it is stated in the endnotes where possible.
Billion and trillion are the English usage.
| Billion | 109; 1,000 million |
| Trillion | 1012; 1,000,000 million |
| ppb | parts per billion |
| ppm | parts per million |
| t | tonne (1,000kg) |
| kt | kilotonnes (1,000 tonnes) |
| Mt | megatonne (1,000,000 tonnes) |
| Gt | gigatonnes (109 tonnes); billion tonnes |
| μg | microgram (a millionth of a gram; 10−6g) |
| micron | 10−6 metres |
| ha | hectare (10,000m2); 100ha = 1km2 |
| Mha | million hectares; 1 Mha = 10,000km2 |
| kWh | kilowatt hour (unit of energy equivalent to supplying one kilowatt of power for one hour) |
| MWh | megawatt hour (1,000 ... |
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