UPJOKE
photovoltaicssolar heatingpassive solaractive solarfossil fuelchileparabolic troughventilationsustainabilityinsolationconvectioncyclonecarbon dioxidephotosynthesisbiomass

What do you call a solar powered keyboard?

A photosynthesiser

What did a solar powered bulb say to the Sun on cloudy day?

Notice me Senlight

Blonde Inventions

The water-proof towel

Glow in the dark sunglasses

Solar powered flashlight

Submarine screen door

A book on how to read

Inflatable dart board

A dictionary index

Powdered water

Pedal powered wheel chair

Water proof tea bags

Zero pro...

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