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|  | | In order to make predictions of climate change, we have to calculate the effects of all the key processes operating in the climate system. Our knowledge about these processes can be represented in mathematical terms, but the complexity of the system means that the calculation of their effects can only be performed in practice using a computer. The mathematical formulation is therefore implemented in a computer program, which we refer to as a climate model. Various types of climate model are used for climate simulation and prediction. Usually the surface of the earth is divided up using a rectangular grid, and the ocean and atmosphere further sub-divided at different levels to make computation possible (see figure). Best results are obtained with a fine grid and many different levels, but this requires enormous computer power. The limitations of our knowledge and computing resources mean that the results of climate models are always subject to some uncertainty.
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| Emissions cuts needed today to stop reef die-back
by Lane,S., AM on Australian Broadcasting Corporation (ABC) Radio 14 December 2007 |  |
| | Even if the Bali meeting does agree on new, more aggressive cuts to carbon emissions, a group of eminent marine scientists says it may be too late to save the Great Barrier Reef and other reefs around the world. The 17 scientists, led by an Australian professor, say there's only one way to avoid massive marine dieback to coral reefs and that's to cut carbon emissions now. The group has published a paper about its predictions in today's edition of Science Magazine. Download the story in Audio or MP3 format from the ABC Radio website. | |
Read more at http://www.abc.net.au/am/content/2007/s2118855.htm.
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