Specifically, more security for the next block, only. Once that block is mined, the process starts all over again for the next block.
The energy usage reset button is pressed as soon as each block is mined. No energy is "stored".
and is the tree I am cutting a battery too?
wouldn't it be easier (and more sustainable) then to plant trees than mine bitcoins?
Because I can buy fiat currency with BTC, BTC is a fiat currency!