over the last 4 Billion years since it was first formed

The earth's age has been determined, give or take a few tens of million years fault margin, at 4.56 billion years. Either climate began with its creation, or I'd like to know why it began 560 million years later...

Now, I know that we scarcely know anything about the Hadean period, that is, anything prior to ~3.8 Ga - but still...