Half a croissant, on a plate, with a sign in front of it saying '50c'
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Reflecto-top save the climate

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At a very cursory count we have 30 million vehicles in the UK, most have roof which gets hot in sunlight.

The Refecto-top will reflect the sunlight back where it comes from, about 152,000,000 m2, if everyone used one.

not_morrison_rm, Jul 13 2019

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       So that's 1.5e8 out of 5e14m2.   

       Doesn't sound much, but if you start with Actual Physics and work out the proportion of solar energy that ought to be retained by our extra 0.02% of atmospheric CO2, it's not that far out.   

       Ah, and there's a billion cars worldwide, so even better.
MaxwellBuchanan, Jul 13 2019
  

       What proportion of the reflected energy makes it back out of the ecosphere ?
8th of 7, Jul 13 2019
  

       Virtually all of the visible light will.
MaxwellBuchanan, Jul 13 2019
  

       Yes, but that's only a narrow slice of your primary's emission spectrum.   

       Cost/benefit; will the energy consumex by manufacturing and installing the reflectors equal or exceed the energy reflected in their service lifetime ?   

       Who's going to keep them clean and polished ? Wouldn't PV panels be a better investment ?
8th of 7, Jul 13 2019
  

       We're talking about global warming, [8th]. Practicality or usefulness is not a prerequisite.
MaxwellBuchanan, Jul 13 2019
  

       So, my idea to paint myself with white paint might be so useful after all? Scratch one patent...wait...I might be able to flog it to the US navy.
not_morrison_rm, Jul 13 2019
  

       // We're talking about global warming, [8th]. //   

       What sort ? Idiopathic or anthropogenic ?   

       // Practicality or usefulness is not a prerequisite //   

       Ah, right. Alleged anthropogenic ...
8th of 7, Jul 13 2019
  
      
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