As I've always said, the sun is the "Big Kahuna" of climate change on Earth. Everything else is secondary, even though man's opinion of his own self … - Anthony Watts

I've been saying this all along… the sun is the Big Kahuna of climate change on earth.

It's been warmer than today's climate in the past, much warmer. It has been colder than this climate in the past, much colder. We know this for a fact. We know that this happens with or without our activities. ... So why do we insist that we are the ones causing it when for over half a million years it happened several times and we’ve only had this supposedly evil earth killing CO2 belching technology a mere speck of that time? Because, many believe global warming is real and there are people in our political world who want the masses to hand over power over their lives to them, so they say "let us handle it". To make that transition easier, they trot out this false premise, that we are totally responsible for natural occurrences in the long span of our planetary history.

Global warming had become essentially a business in its own right. There are NGOs, there are organizations, there are whole divisions of universities that have set up to study this, this factor, and so there's lots of money involved and then so I think that there's a tendency to want to keep that going and not really look at what might be different.

If both Mars and Earth are experiencing global warming, then maybe there is a larger phenomenon going on in the Solar System that is causing their global climates to change, like changes in the Sun.