Twenty years is nothing in the life time of this planet on which changes take place constantly anyway. Just cast your net under the seas and discover many many lost cities and civilisations. Living on planet Earth means change, regularly.
So, coastlines will change, temperatures will diverge and basically, it is the pattern of planet Earth that we live on and there is nothing we can do about climate change except try to slow down the very small part that we as humans have to do with it.
We will adapt even if we suffer terribly. Hopefully things won't get so bad so that the human race has to start at the beginning again.....but there have been more advanced civilisations than us before, and they no longer exist. Perhaps our turn has come and we need to start again.
I find I'm neither sad or disheartened. What will be, will be and we must take each day as it comes.
We will rise again.....in time. I'm sorry to think of our future generations having to suffer again, but suffering has never really gone away and I can only wish them the best and hope that they realise it was not the fault of the ordinary man and woman, but just the way it is.
We have come full circle.