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The hardfork has been planned for some time - its going to be phasing in the difficulty bomb which will increase the difficulty to the point where mining won't be sustainable anymore.
It is meant to transfer the PoW to PoS - so you will be able to hold ETH and "mine" it that way.
Theres alot up in the air right now, as the hardfork is being tested but it should be fine - according to the plan, at least

Thank you very much for your informative reply. Cheers mate

You need not to be worried. just make sure your etherum are in a hardware wallet, paper wallet or on myetherwallet in order to be safe

Would it be safe in coinbase? Cheers mike

No mate, coinbase is centralized more over if you move it to myetherwallet you would get separate chain coins as well... We don't know if coin base would give this to you...

Thank you very much for your advice cheers mate