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The IPCC report suggests first-world citizens reduce their energy footprint by 80% if we are to have even a remote chance of keeping things under control. Yet everybody is now making plans where to travel next when the pandemic becomes milder.
Meanwhile Germany closed half its nuclear reactors yesterday and people were cheering.
Are you sure you want to save this version of humanity?
This could be hard to do such early in your life, as one does not have much experience. Usually it falls in one of two categories - either you are someone that can do the work but needs support and guidance, or you prefer working on your own, in which case a more hands-off supervisor would be OK.
If you are of the former type and find yourself working for a supervisor that doesn't offer much support, it will be very hard to finish anything, and most likely you will become demotivated and drop out. Likewise, if you want to try things on your own but your supervisor wants to dictate where to go next, there will be a lot of conflicts and even the possibility that they block the thesis until it is done their way.
Having other PhD colleagues around and bouncing ideas off of them is worth its weight in gold, make sure that there is at least one that is working on something similar as you are.
If any undergrads are reading, the short advice is - don't start a PhD unless you are very good or your supervisor is very good. Look at introductory courses for PhDs to get a feel for it. Research is a whole different ball game than studying for exams etc.