That means if the governments like I read above a scenario tha stop meaning forever or put out countries of big mining farms the difficult re-adjusting can take in a worse scenario months as not weeks. All those are scenarios, even if it happens developers can solve it, you should not worry.
Also make your thoughts the affect of such of scenarios can be, no newly coins mint, no transactions confirmations, a frozen blockchain. But don’t worry.
If mining tops completely there will be no adjustment, none whatsoever without a single miner out there mining there won't be a new block and obviously, no way to adjust the difficulty, of course, that's impossible but in such a scenario that's what's going to happen, a frozen chain with no blocks no confirmation no way to move coins.
Let me add that Bitcoin in a worsted scenario can work without internet, that’s say don’t worry.

In the worst-case scenario we could make bitcoin work by manually solving hashes and sending them between mining farms and by carrier pigeons, that doesn't mean it's feasible nor that it will be the same.
Sorry I can’t find any doses of humour regarding the manual solving hashes and carrier pigeons.
As I said Bitcoin can works without internet(TCP). The chain will be frozen due to high difficulty this can be solved with a 1 line of code.
but no internet means no energy conversion. The whole reason bitcoin has value is energy conversion into coins.
and now the heat the miners make can be used for good.
below is a 4ph server water cooled setup that could be used to heat 2 enclosed olympic sized swimming pools.

this is how you convert energy to wealth.
the op is correct if the world's governments ban mining they will fuc all pow coins up.
but it the world's government's launch enough nukes everything fucks up.
So basically the hope is saner and cooler heads prevail.
Solar energy is practical for 40 lat north down to 40 lat south. mining coins could be the incentive to build more solar.
And not what is the governments shut down all mining
How about what if the world's govrement's make all pow coins mined via solar arrays non taxable.
I am tired of thread after thread of what is we fuck ourselves.
How about what if we help our selves?
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Nah, even if they decide something like this believe me, may the energy consumption will be a justification, the real reason will be that they want’s to stop something that they can’t control.
No internet doesn’t mean no energy conversion, miners still will be able to solve blocks just they will not broadcast it over TCP.