The Bush administration tried to prevent Jim Hansen, Director of NASA’s Goddard Institute for Space Studies, talking to the press about climate change but the plan backfired. Here he gives his expert opinion on the global warming debate in the New York Review of Books, including this alarming warning:

As explained above, we have at most ten years — not ten years to decide upon action, but ten years to alter fundamentally the trajectory of global greenhouse emissions. Our previous decade of inaction has made the task more difficult, since emissions in the developing world are accelerating. To achieve the alternative scenario will require prompt gains in energy efficiencies so that the supply of conventional fossil fuels can be sustained until advanced technologies can be developed. If instead we follow an energy-intensive path of squeezing liquid fuels from tar sands, shale oil, and heavy oil, and do so without capturing and sequestering CO2 emissions, climate disasters will become unavoidable.

An article in Scientific American details the latest research on how supervolcanoes form and erupt, and how their eruptions can have long term effects on the atmosphere.

The oxygen 17 excess and other chemical patterns that we found in sulfate from the Yellowstone and Long Valley ash samples thus implied that significant amounts of stratospheric ozone were used up in reactions with gas from the supereruptions in those regions. Other researchers studying the acid layers in Antarctica have demonstrated that those events, too, probably eroded stratospheric ozone. It begins to look as if supervolcano emissions eat holes in the ozone layer for an even longer period than they take to cool the climate.

This loss of protective ozone would be expected to result in an increased amount of dangerous ultraviolet radiation reaching the earth’s surface and thus in a rise in genetic damage caused by rays. The magnitude and length of the potential ozone destruction are still being debated. Space observations have revealed a 3 to 8 percent depletion of the ozone layer following the 1991 eruption of Mount Pinatubo in the Philippines. But what would happen after an event 100 times larger? Simple arithmetic does not solve the problem, because the details of atmospheric oxidation reactions are extremely complex and not fully understood.

A surgeon answers the question ’What’s it like to cut in to somebody?‘:

Nowadays, routine surgery, such as breast biopsies or other elective surgery, it doesn’t even raise my pulse anymore. But I never forget that, society has granted me and relatively few others the privilege to cut into living human bodies legally in order to try to cure them of disease. I like to think that I’ve earned that right through my skill, but it could just as easily have gone the other way.