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Does greener flights mean a lot less affordable flights?

The fact is: nobody knows. Electric planes could be very useful for short distances. For long-distance flights, the battery cost investment is rather high, the weight of the plane increases rapidly (...
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What's the effect of space launches on climate?

I think this is negligible. Space shuttle uses 0.6 million kilograms of liquid oxygen and 0.1 million kilograms of liquid hydrogen per each trip. So it's not even using fuels that would emit carbon. ...
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