Charging computer by natural energy
Windmill, solar power, hydropower,
geothermal energy, wave power etc
are the natural ways for electricity generation
without possibility of destroying the whole earth.
We should stop dealing with those dangerous materials
that we are not sure that they are safe enough for people in the future.
Driving through the villages in France
houses with household size windmills on the roofs were seen occasionally.
They looked beautiful and functional.
The little red van has a solar panel on the top of the roof : )