by Rolf Schuttenhelm, cross-posted from Bits of Science

The results of studies that try to quantify the effects of climate change on biodiversity loss — which include damage to the micro scale level of subspecies and genetic variation — are perhaps most shocking.

When, however, you focus on the response to climate change at the macro level, the ecosystem level, you get a better understanding of what is one of the major drivers of that biodiversity loss: forced migrations. And even here, the numbers may be larger than one would expect, as a new assessment by NASA and Caltech published in the journal Climatic Change shows that by 2100 some 40 percent of “major ecological community types” – that is biomes like forest, grassland, tundra – will have switched to a different such state.

According to the same study most of the land on Earth that is not currently desert or under an icecap will undergo at least a 30 percent change in vegetation cover.

Ecological damage is the real climate problem

Based on IPCC temperature projections for 2100 [which are probably on the conservative side] of 2-4 degrees Celsius warming scientists of NASA’s Jet Propulsion Laboratory and the California Institute of Technology ran special computer models to calculate the most probable ecosystem responses across the planet. This average temperature rise is of similar magnitude to the warming that occurred between the Last Glacial Maximum and the onset of the (milder) Holocene – with the big exception that the current warming is happening about 100 times faster – and for ecology that makes a huge difference, the authors stress.

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The Debunking Handbook is a guide to debunking myths, by John Cook and Stephan Lewandowsky. Although there is a great deal of psychological research on misinformation, unfortunately there is no summary of the literature that offers practical guidelines on the most effective ways of reducing the influence of misinformation. This Handbook boils down the research into a short, simple summary, intended as a guide for communicators in all areas (not just climate) who encounter misinformation

This is part one in a five-part series by John Cook originally published at Skeptical Science.

Introduction

Debunking myths is problematic. Unless great care is taken, any effort to debunk misinformation can inadvertently reinforce the very myths one seeks to correct. To avoid these “backfire effects”, an effective debunking requires three major elements. First, the refutation must focus on core facts rather than the myth to avoid the misinformation becoming more familiar. Second, any mention of a myth should be preceded by explicit warnings to notify the reader that the upcoming information is false. Finally, the refutation should include an alternative explanation that accounts for important qualities in the original misinformation.

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by Michael Conathan

This year was a big one for fisheries. If you’re into fishery legislation and important milestones, you already know that it was the 35th anniversary of the Fishery Conservation and Management Act, the law that first ejected foreign fishing fleets from the United States’ exclusive economic zone and provided the foundation for how we manage our fisheries. It was also the 15th anniversary of the Sustainable Fisheries Act and the fifth anniversary of passage of the Magnuson-Stevens Fishery Conservation and Management Reauthorization Act, the last two major updates to our fisheries statute.

But there were also many significant developments this year that will benefit our fishing industries and our marine environment for generations to come. Here’s a quick rundown of the top five stories in fishery management from 2011.

1. Ending overfishing in America

By far the biggest story of the year in fisheries management was the successful implementation of annual catch limits in our fisheries. This effectively ended overfishing in America. In March, National Marine Fisheries Service Administrator Eric Schwaab announced that his agency was on track to implement science-based catch limits on all 528 federally managed species of fish, thereby preventing overfishing—the act of catching more fish than science dictates can be sustainably harvested—from occurring in U.S. fisheries.

Of course, fisheries science remains an elusive discipline, and our estimates of fish stock populations are rife with variables. This means that as more data are collected, our perceptions of the health of fish populations may change, and we may realize that what we thought were sustainable harvest levels may have been overly optimistic.

Still, given that fisheries scientists don’t have a crystal ball showing what the future holds for fish populations, operating within limits that reflect the best science we have still gives the United States worldwide bragging rights to say our fisheries are the most sustainably managed on the planet. And that’s no small feat. So whether you’re putting a piece of Alaskan salmon or Atlantic swordfish on your plate, you can end 2011 with the assurance that if it’s U.S.-caught, it’s sustainable.

2. Cracking down on pirate fishing

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