In the "Things I never worried about" department

What a strange and interesting place our solar system is. It appears we have another burst of solar wind hitting us (or hit us last night) [link]  I scanned the headlines of articles Google deemed  "related content" and caught this headline:

Our Sun May Have Been Bigger Long Ago

That intrigued me. So I read through it and learned a few interesting things. Like some of the theories attempting to explain early climate in relation the sun's output. 

Most stars tend to increase in luminosity as they get older. This is due to their cores becoming denser and thus hotter over time. Assuming our sun has followed this same trend, one can estimate that it was 30 percent fainter 4.5 billion years ago.

"The faint young sun presents us with a paradox, because the predicted temperatures on Earth and Mars would have been too cold for liquid water," said Steinn Sigurdsson of Penn State University.

Too cold for liquid water? Not likely. Evidence in the oldest rocks suggests that Earth had liquid oceans as far back as 4.4 billion years ago. On Mars, scientists have built up a case that it too was warm and wet around 4 billion years ago. [7 Biggest Mysteries of Mars]

The theories trying to explain this, it turns out, have to be reconciled with the traditional "climate change" community.

Things are not so simple as they seem, are they?