In The Register, Lewis Page tries to round up the varied results of some recent biodiversity/climate change reports:
A volley of studies into the likely effects of climate change on various animal species — and thus on biodiversity worldwide — have come out in the last few days. The headliner, examining butterflies in Massachusetts, seems to indicate that rising temperatures are having powerful ecological effects: but another pair of studies showed that other factors may be more powerful than warming, and yet another appears to indicate that dangers are being overblown.
[. . .]
“For most butterfly species, climate change seems to be a stronger change-agent than habitat loss. Protecting habitat remains a key management strategy, and that may help some butterfly species. However, for many others, habitat protection will not mitigate the impacts of warming,” comments study author and Harvard postdoc Greg Breed.
Open and shut, then — the warming seen from the 1980s to the turn of the century has already seriously affected butterflies, and projected future warming will surely mean more serious consequences. Many people, indeed, have not hesitated to link recent severe weather events in the States to global warming — despite a refutation of this idea from no less a body than the IPCC. But as it is well known to all followers of pop-science coverage that just one butterfly beating — or not beating — its wings can have major effects on the weather in the northeastern United States, it seems only reasonable to suggest that the invading Zabulon Skippers, apparently wafted into Massachusetts by global warming, are responsible for recent storms, floods, heatwaves etc.
[. . .]
Or, in summary, scientists don’t really know what will happen to any given species in future.
“Taken together, these two studies indicate that many species have been responding to recent climate change, yet the complexities of a species’ ecological needs and their responses to habitat modification by humans can result in unanticipated responses,” says Steven Beissinger, professor at UC Berkeley and senior boffin on both studies. “This makes it very challenging for scientists to project how species will respond to future climate change.”
Yet another recent study announced in the past week goes still further, suggesting that the danger to Earth’s biodiversity posed by rising temperatures has been exaggerated.
