The phrase "earth changes" is often used to refer to some kind
of disastrous event that will adversely affect much if not most
life on Earth, including human life. There is thought about
preparing ourselves for it, but the phrase is vague about what
it could be.
Among the kinds of CMEs that can severely threaten much of the
life on Earth are the coronal proton ejections (CPE) or Solar
Proton Events (SPEs) that have have appeared to have
occurred several times in history. One such event today could
wipe out much of humanity and leave the Earth devastated. It
could bring radiation, massive wildfires, and other destructive
It differs in severity from coronal mass ejections like the
Carrington event of 1859, Those are CMEs, but do not in general
threaten life rather than power grids, which could be
devastating enough in this modern age of dependence on
electronic devices of all kinds. There are calls such as the
Shield Act to harden electric grids against them.
The main suspected SPE impacted the earth about 12,900 years
ago. There may have two such events, 12,837 years BP and 12,639
years BP. They could have been a principal cause of the final
termination of the Pleistocene megafauna and even of several
genera of smaller mammals and birds. There is also evidence of
less intense event in 2012 that missed the Earth by only two
weeks. One of the things that it does that could cause mass
extinctions is to raise the level of proton bombardment to fatal
levels. They are also suspected of causing massive, planet
Type G stars like the sun are not observed to produce massive
flares such as the one hypothesized to have harmed life on
Earth. The only stars observed to do that are type "T Tauri"
stars, but those stars are young, only about 100 million years
old. They are generally composed of almost pure hydrogen, with
little helium or traces of heavier elements. They are typically
surrounded by rings of debris, thought to be primordial planets.
The sun is about 4.6 billion years old. It contains helium and
other heavy elements. T Tauri stars flare frequently and
massively. But it seems unlikely that the sun would revert to a
T Tauri phase.
There does not appear to be evidence of previous proton storms
that could have caused mass extinctions. The 12,900 year old