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Comment: Re:a bright future (Score 1) 40 40

The burden of proof is on you.
I showed that typical airplanes would need 500m2 of pv panels per passenger in order to fly, even with a perfect propulsion system and maximum solar irradiance.
You need to describe a functional airplane that somehow needs about 10 or 100 times less pv panels to fly.

Comment: Re:a bright future (Score 4, Informative) 40 40

it makes it very clear that it's entirely possible to replace our environmentally destructive planes with solar planes.

Once again : Not, it's not possible.
Here's a comment I posted 5 years ago :
The laws of thermodynamics haven't changed much since.

Comment: Re:Google is too wild . . . (Score 4, Informative) 328 328

If you try to access from Germany, it automatically redirects you to
If you want the "original" Google from abroad, you need to type
This link should work the same all over the world :

Comment: Re:Sad, isn't it? (Score 1) 529 529

The thing is, they really get bad symptoms from all this anxiety. Call it a self-fulfilling prophecy.
It's like those people in Ukraine that lives relatively close to Chernobyl.
Many think "Shitty life, too much radiation, we have no future". So they all drink, smoke, take weird drugs and live like there's no tomorrow.
The radiation isn't high enough to have any direct impact on their body, but they're doomed to die young nonetheless.

Comment: Re:well done. (Score 2) 289 289

Or a slight variation :
you want to boot your laptop for a presentation in front of a few hundred people.
It's 8:50 in the morning, your presentation is at 9:00.
You get a nice blue screen that tells you "Please wait till 30 updates are installed". Then you get "Please wait till 200000 files are updated".
It often takes more than 30 minutes to do so.

Comment: Re:Paul Ehrlich? (Score 1) 294 294

Yes, now we begin to agree.
It's true that we could live sustainably, provided we stop using cars and planes for everything, we live in smaller flats, we eat local and seasonal food, and stop buying so much crap.
Even though we could, the real question is if we ever will do so before it's too late.
The heavy smoker could also stop smoking any day in theory. But in practice?

I hope you're right for the demographic curve. I'm not so optimistic. WW2 didn't change much the demographics curve for example. You really need a shitload of famine/war/drought to kill a few billion people.

The rule on staying alive as a forecaster is to give 'em a number or give 'em a date, but never give 'em both at once. -- Jane Bryant Quinn