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Global warming changes natural event: first causal link http://apocadocs.com/s.pl?1269093298
For the first time, a causal link has been established between climate change and the timing of a natural event - the emergence of the common brown butterfly.
Although there have been strong correlations between global warming and changes in the timing of events such as animal migration and flowering, it has been hard to show a cause-and-effect link.... The researchers compared temperature changes in Melbourne - where the butterfly is common - with recorded observations of the first brown butterfly to be seen in the spring since the 1940s.
With each decade, the butterflies emerged 1.6 days earlier and Melbourne heated by 0.14 °C. Overall, the butterfly now emerges on average 10.4 days before it did in the 1940s, says Kearney. "And we know the rise in air temperature links to butterfly emergence in a cause-and-effect pattern."
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[Read more stories about:
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