How quick are we to blame climate change?
Is this a tell-tale sign of climate change linked to greenhouse gas emissions, with the cardinal moving north in response to a warming planet?
Or are other factors at play, such as the proliferation of bird feeders in urban yards, which may be enticing species away from their historic ranges?
Such debates are bound to heat up with a draft U.N. report on climate change set for release in Paris on Friday.
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The northern cardinal's move into Nova Scotia and a northward thrust by the turkey vulture into southern Maine and Nova Scotia from Massachusetts are some of the shifts which can clearly be seen by looking at maps from the two editions.What do you think about the article?
The movements are there over short periods of time, suggesting that human induced changes in the environment are the cause. And they are not dramatic, which could point to gradual shifts from rising temperatures.
But the explanation, at least in the cardinal's case, may simply lie in the bird feeders found in Hale's garden and those of her neighbors.