A CME is presumably a coronal mass ejection, Bob ?
Yes.
They happen fairly regularly and 'often' in geological terms. The solar energetic particles strike the Earth with such force that it ionizes the atmosphere, creating a vast cloud of energetic electrons that bounce around inside the atmosphere destroying electronics and fusing conductive wires everywhere.
The 2012 event missed us by a hair's breadth
The 1989 event caused the Quebec blackout
The 1859 event destroyed much of the Victorian telegraph network in Europe and North America
We have just about covered the planet since then with networks that rely on power.
Now imagine a planet with no electricity or electrical systems.... no communication, no transport, no energy, no water, no hospitals, no drugs, only a few days of food, farming set back to the middle ages, etc.
I won't sugar coat it, it is a very very scary thought but would probably be the only way to make a Global difference to Climate change and allow Nature to take the planet back under control however I won't pray to the Sun for one but it would be poetic justice if we won't heed the warnings and do something about only for the Sun to reset the balance. Yes, we can shield electrical systems and infrastructure from it and be safe but again, that reduces profit and is also seen as 'unnecessary'.
I fear that for all our hubris, we will never learn.