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In the 1990′s the classic Vostok ice core graph showed temperature and carbon in lock step moving at the same time.

It made sense to worry that carbon dioxide did influence temperature.

But by 2003 new data came in and it was clear that . Temperatures appear to control carbon, and while it’s possible that carbon also influences temperature these ice cores don’t show much evidence of that.

After temperatures rise, on average it takes 800 years .

If both factors caused each other to rise significantly, positive feedback would become exponential. Permission for use: These images are available for media and non-profit use.As a courtesy please email me “joanne AT au” (replace the ‘AT’ with ‘@’). There are also larger files available in tif format for printing.Click on the link to the right hand side of each graph.Note: The temperatures here are measured in relation to the present temperature.In other words, most of the time for the last million years it’s been much colder. The basic science behind climate change is actually quite simple.The story began nearly 150 years ago when Irish physicist John Tyndall discovered ‘carbonic acid’ – today known as carbon dioxide – was one of a number of “perfectly colourless and invisible gases and vapours” to absorb radiant heat.He also realised just how important this was to life on Earth as without such gases it would be “held fast in the iron grip of frost”.About 40 years later, the Swedish scientist Svante Arrhenius first suggested that increasing the amount of carbon dioxide in the atmosphere would cause the global temperature to go up, particularly in the Arctic.But the idea remained mostly an academic question until, as he predicted, the mercury started to rise.This is one of the certainties in climate science – the world has got warmer.

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  1. Dating is a stage of romantic relationships in humans whereby two people meet socially with the aim of each assessing the other's suitability as a prospective partner in an intimate relationship or marriage.