<P> Research published in 2009 found that overall the continent had become warmer since the 1950s, a finding consistent with the influence of man - made climate change: </P> <Dl> <Dd> "We can't pin it down, but it certainly is consistent with the influence of greenhouse gases from fossil fuels", said NASA scientist Drew Shindell, another study co-author . Some of the effects also could be natural variability, he said . </Dd> </Dl> <Dd> "We can't pin it down, but it certainly is consistent with the influence of greenhouse gases from fossil fuels", said NASA scientist Drew Shindell, another study co-author . Some of the effects also could be natural variability, he said . </Dd> <P> The British Antarctic Survey, which has undertaken the majority of Britain's scientific research in the area, stated in 2009: </P>

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