Re: [geo] Re: RESEARCHERS INVESTIGATING LARGE SUNSHADES TO COMBAT GLOBAL WARMING

I find the idea of space-based sunshades interesting, but I'm skeptical that it will ever be practical relative to Earth-based alternatives. Even assuming the sunshades are indeed manufactured in space with off-world (i.e. lunar or asteroid) resources, the prospect of manufacturing and assembling a

Re: [geo] Negative Emissions: Arrows in the Quiver, Life Preserver, and/or Moral Hazard?

John, There is a session here at AGU :" Impacts and Mitigation for 1.5C warming and other warming targets" It is a pity you were not here. Essentially, they are saying 1.5C is livable, only affecting 200 million people, where as 2C displaces 500 million. I find the approach is alarming.

Re: [geo] Re: RESEARCHERS INVESTIGATING LARGE SUNSHADES TO COMBAT GLOBAL WARMING

No, Andrew it would be rather short-lived, decades, say, and even that would require active position maintenance. Remember, the sausage-shaped region around L1 is metastable, not truly stable. So something has to work, albeit not very hard but all the time, to keep itself there. But at least

Re: [geo] Re: RESEARCHERS INVESTIGATING LARGE SUNSHADES TO COMBAT GLOBAL WARMING

I should have added that it could be phased down as the CO2/GHG concentrations were lowered or over the likely longer term they would take than the Dyson dots. The real problem is not that the dots would be long lasting--they would need to be controlled to stay roughly where they are, so easy

Re: [geo] Re: RESEARCHERS INVESTIGATING LARGE SUNSHADES TO COMBAT GLOBAL WARMING

Such a system may outlast civilisation. How would it self correct or self destruct as CO2 levels fell? Would it endanger observational satellites or passing spaceships? A On 13 Dec 2016 22:13, "Michael MacCracken" wrote: > Dear Robert--Very interesting. Given the time scale involved, maybe wh

Re: [geo] Re: RESEARCHERS INVESTIGATING LARGE SUNSHADES TO COMBAT GLOBAL WARMING

Dear Robert--Very interesting. Given the time scale involved, maybe what to be thinking about, in global climate intervention sense, is stratospheric aerosols first as this can be done quickly, but they have a number of disadvantages, including the problem that backscattering is only about 10%

[geo] Re: RESEARCHERS INVESTIGATING LARGE SUNSHADES TO COMBAT GLOBAL WARMING

Hi, there, everybody and greetings from Dar es Salaam. I'm here in Tanzania on a geothermal job. Over a year ago, I posted a PDF of the full paper from JBIS to this group, but no comment ensued. Look for the keywords "Dyson Dots". We (R.G.Kennedy, E.Hughes, K.I. Roy, D.E.Fields) have been wor

Re: [geo] Stratospheric solar geoengineering without ozone loss

Hi All The site https://www.cdc.gov/niosh/docs/81-123/pdfs/0090.pdf may be useful. We need to be sure that there is no quartz along with the calcite. In contrast check out http://www.express.co.uk/life-style/health/423396/Can-sitting-in-a-salt-cave-cure-my-asthma I have always believed 't

Re: [geo] RESEARCHERS INVESTIGATING LARGE SUNSHADES TO COMBAT GLOBAL WARMING

Hi All Roger Angel suggested that the radiation force of light form the sun could be adjusted by tilting the planes of the mirrors slightly away from the sun beam. This could allow control of distance from the sun and other reflectors. Stephen Emeritus Professor of Engineering Design. Scho

[geo] Climate Engineering News Review for Week 51 of 2016

Climate Engineering News Review for Week 51 of 2016 Upcoming Events and Deadlines · 12.-16.12.2016, AGU Fall Meeting; list of CE relevant papers