More like 20 earths. “5% of generated electricity” isn’t “5% of energy use”, by a decent margin.
https://en.wikipedia.org/wiki/Wind_power: “In 2021, wind supplied over 1800 TWh of electricity, which was over 6% of world electricity and about 2% of world energy”
Yes. In most applications, literally 45-70% of the fossil fuel is burned just to generate waste heat. This is a huge advantage for renewables, where it doesn't matter that you're not capturing all the energy in the wind going past, because it's not being consumed or generating waste.
https://en.wikipedia.org/wiki/Wind_power: “In 2021, wind supplied over 1800 TWh of electricity, which was over 6% of world electricity and about 2% of world energy”