From the category archives:

Climate change

Arctic sea ice yesterday

July 3, 2010

In 2007, the area of Arctic sea ice reached a record low. By comparison, here’s the current story:

   National Snow and Ice Data Center

Looks low by about 4 standard deviations. (Yes, too much geophysics & climate…)

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Reshaping airframes & expectations

May 17, 2010

Like most people with a conservative engineering mindset, I usually assume that major commercial technologies are designed to work reasonably close to the limits of current fabrication technologies (currently practical materials, subsystem performance, etc.). Then something like this comes along:
…an MIT-led team has designed a green airplane that is estimated to use 70 percent less [...]

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Space data lost to whale-oil shortage

March 26, 2010

The satellite soared over Earth in a polar orbit every 108 minutes, taking pictures of cloud cover and measuring heat radiated from the planet’s surface, and creating a photo mosaic of the globe 43 years ago. The resulting image is the oldest and most detailed from NASA’s Earth-observing satellites. It’s also the latest success story [...]

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Why fusion won’t provide power
   (at a reasonable cost)

January 20, 2010

The greatest problem with fusion power is rarely mentioned and scarcely on the research agenda: capital cost. When I discussed the problem earlier, in “Fusion Power: A New Way to Boil Water”, I hadn’t seen this quietly damning report, which I think is worth quoting:

Issues and R&D needs
for commercial fusion energy
An interim report of the
ARIES [...]

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An Ecopragmatist Manifesto

October 24, 2009

This week, with the help of Viking Press, Stewart Brand has offered the world an important book on the collision between humanity and the Earth’s limits — on the facts, the problems, the passions, the politics, and the realistic possibilities for better outcomes.
After Whole Earth Discipline appeared in my mail, I opened it and skimmed [...]

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Fusion Power: A New Way to Boil Water

May 2, 2009

The plasma fusion research community has released conceptual designs for fusion power plants, and in every one that I’ve seen, “fusion power” means “heat used to produce hot gas”, usually by boiling water to produce steam. The gas drives turbines that turn generators, producing electric power with a typical efficiency of about 33%. In other [...]

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Pyrite Nanomaterials for Solar Photovoltaics

March 13, 2009

A new paper in the journal Environmental Science & Technology assesses the requirements for scaling solar photovoltaic systems to the terawatt levels needed to supply electric power on a global scale. The authors identify iron pyrite, FeS2, as an attractive but unconventional alternative: The raw materials for pyrite aren’t scarce, and both the energy and [...]

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One Watt, One year, One dollar
(pass it on)

March 8, 2009

For residential customers in the U.S., the average price of electricity has recently* been at $0.115 per kilowatt-hour. This works out to almost exactly $1.00 per Watt-year:
Leave a 100 Watt light bulb on for a year, pay $100.
I found this surprising when I calculated it. The number is simple, memorable, and encourages conservation. Pass it [...]

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Ocean Acidification: The Other CO2 Problem

February 1, 2009

There’s recently been another ripple of media attention to the other CO2 problem: Not climate change, but ocean acidification. In brief: The oceans absorb a portion of CO2 emissions; this mitigates greenhouse warming, but forms carbonic acid, lowering ocean pH. Acidification of the oceans impedes the formation of coral and shells, and within decades, if [...]

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Greenhouse Gases and Advanced Nanotechnology

January 1, 2009

The greenhouse gas problem is far more intractable than most people think, and although there is a solution in sight, we will need a technological revolution to implement it…. molecular manufacturing capabilities will make it possible to reduce CO2 concentrations to pre-industrial levels within a short time span.

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