> Earth's climate always changes over time, it's not unusual, although not always the best for us.

Earth's climate has been stable during the rise of human civilisation. It has changed more in the past 100 years than in the past 200,000.

It's true it's changed often over the course of the 4 billion year history of the pkanet. It's not true to claim it's fluctuated wildly over the course of human civilisation.

> What causes this climate change, how much infuence humans have on it, and how much we could possibly do about it is unclear.

False.

It's clear the cause is the increased insulation factor of the atmosphere. It's clear this change has been in the majority due to human activity dragging up millions of years worth of past captured C02 via fossil fuel extraction.

> That's not a reason to not do anything about it,

Naturally, because as stated it is false to claim the cause is unclear.

> but there's also no reason to be super intense about it.

Sure. It's true that no one alive today in a G20 non equatorial country need fuss much about it - all the real serious consequence will fall after their lives have passed.

Dammit - I went a zero too many, human civilisation ~ 20,000 years worth of "settled" building, agriculture, slowly increasing in scale as climate variations decreased in scale.

Everything that is "modern human civilisation" from, say, early Egyptian onwards (following the formation of the Sahara some 6,000 years past) has taken place in a period of climatc stability.

Point being, come climatic change on that scale again, the planet and various eco systems will adapt and move on, human civilisation patterns as we know them from history will be heavily jarred.

Cheers for that.

As a general note, @7402 was right to question my comment, particularly with a supplied reference to university course notes.

I made a fat fingered typo, they made a respectful statement of fact, downvotes are not deserved here, if anything throw @7402 a few upvotes for taking part as the HN guidelines encourage.