Climate change is probably the most clearly a “big fucking issue” for mankind. I’m fully aware it’s going to kill a huge portion of the population before the end of this century and that I’m probably going to be one of them. I don’t expect to retire or have any kind of life beyond MAYBE 60 because we’ll be locked in famine wars and constant civil unrest.

Can't say I haven't wandered those paths of thought, but what keeps nagging at the back of my mind is the possibility of a positive feedback loop of ecosystem collapse, cascading through all of it. From my limited understanding it's somewhat likely to happen but nobody can tell the exact likelihood or outcome. Best guess likelihood of it happening climbs exponentially between 1.5°C and 5°C of warming, which is why limiting warming to 1°C was determined as a threshold initially and subsequently raised to 1.5°C because 1°C became a pipe dream. Depending on how pessimistically you want to do your measurements we have now already reached those 1.5°C of warming.

For reference: Wikipedia:Tipping_points_in_the_climate_system#Cascading_tipping_points

The rise of global fascism and it’s persecution of “the other” or “enemies of the state” as seen in the USA, Israel, China, Russia, North Korea, Afghanistan, Pakistan, The Philippines, and many South American and African nations is another major issue that’s being largely ignored and/or actively progressed by an alarming number of people today. Is another thing that is being underplayed in the media and it going to ADD TO the major global instability that climate change is going to cause.

Yeah tell me about it, the far right party in Germany keeps getting new poll records, now breaking 20%. In fucking Germany! Thought I'd never see the day. And therein lies the crux. I think the move towards the right on a global scale is in large part reactionary towards the largest problem on a global scale happening right now, which is climate change. Of which we keep seeing incrementally bigger symptoms, chiefly among them in this context migration as well as economic problems related and unrelated to that. The sensory information of our society already indicates how vast this problem will be. And unless the underlying cause is fixed, this trend won't reverse itself; On the contrary, we will see democracies collapse left, right, and centre, pun intended.

OP is in their mid-40s.

Ok, this is too ad hominem for me, so I'm going to disregard that part of the argument.

I’d hate for our discussion to be about semantics,

Semi-off-topic rant incoming, but hard disagree on this one. This is a really weird statement that is commonly used for the opposite of what it actually means (although not in this case). I don't enjoy syntactical discussion, e.g. whether I used the wrong sentence structure or whatever, as long as the meaning is clear. But discussion on "the meaning of words", i.e. their semantics, is absolutely necessary in many cases, here about whether we use the same definition of this idiom. You can't properly communicate without that, so if you don't discuss semantics where appropriate you are talking at each other instead of with each other, despite using the same language.

but I’m saying that we don’t believe in the problem.

Case in point here, you are operating from your intuitive definition of the head-in-the-sand idiom which doesn't fit the situation at hand, I'm operating from the Merriam-Webster definition which does fit the situation at hand.

Just to be clear, I don't intend any judgement here, just saying it fits that one specific definition of this idiom, which is why I quoted it originally.

As stated in the grandparent of this comment I can agree with many of your examples, so I understand your revulsion of categorising your behaviour as sticking your head into the sand. But to people who recognise and acknowledge the problem, unlike you who recognises but doesn't acknowledge the problem, you are sticking your head into the sand.