What other endorsement could one possibly need?

Unless there's something lacking in the brain of climate change deniers (which as nice as it might be to believe that, there's no evidence to back up), they should be able to match the many people who are reacting in horror and fear to it.

Just my personal opinion on why this might be the case.

It's perhaps that people have hard time understanding the scale of the issue. They think, few inches so what?? but the downstream effects of it are catastrophic.

Even if as you are suggesting that millions of people might die, its hard to imagine the scale of that or how that might look like.

On the other hand, I have seen people far more passionate even about the lives/death of a single person. Maybe its the story telling aspects of it which plays a part in why a person cares about an issue or not, also how society reacts to problem.

A man looks upwards, if everyone else around him is running saying the sky is falling. He might assume so too, but if everyone else is acting the same nonetheless, (Sure people are speaking but Words are cheap and actions are hard and its actions of our society that we subtly pay most attention to.)

Maybe realizing this, I feel as if its a chicken and egg problem. We want people to care but people care especially more only if society at large cares about it but society is made up of people.

Going on a tangent, I come to this topic of chicken and egg a lot in my life. It feels as if things can be stuck and perhaps this also explains why things aren't improving, because if it did improve then I wouldn't be talking about it.

But because I am talking about this problem, it means that its usually involved of factors including societal/social dynamics and people are complicated and complex and its a hard problem to solve.

But just because it could be hard doesn't mean it isn't impossible. We can try to be helpless or doomerist about it but also Humanity has shown from time to time to do the (hard things) or even impossible things. Humanity is really impressive in that sense but also unpredictable and as such, I have given up the ability to predict the future but I have hope and trust within my heart that we could (together, as a society) fix this issue of climate change for our next generations because our generation borrows it from the next one and we should try to give it in good shape because why not/why shouldn't we.

I hope that we do, in fact, give a better future to the next generation and give them hope. Or certainly we can try to try our best in this possibility and perhaps be aware of the dynamics at play.

Unfortunately, given current trajectory that's how the mother nature is going to bring back balance. I wouldn't be surprised even billions die.

Let's look at me: I don't own a car, live in a smaller town, move around mostly on foot, take public transportation, long distance mostly train. I have two kids and for years my electricity total was 1500kwh a year. Last year it was 1100kwh (heating is gas though, that's what my building has). All this and I do cook a lot with an electric stove. I bought some new appliances before the old ones were completely broken (although they were close) partly because the new ones were all very energy efficient.

But: I live abroad and take my kids to my parents once a year, and fly. Last year I flew four times, including intercontinental (albeit a true outlier of a year). I consume things produced all around the globe, either as items like phones, or food, and the food I do probably daily (I really like fruit, so bananas, mangos, avocados etc).

My point is: my carbon footprint is pretty low, and I try to be mindful about not wasting resources. And it's not that hard, I don't feel like I am missing out on something if I don't drive a car. But I still took my kids to Spain on a vacation, and we still flew there to sit on the beach. Giving that up is hard, and making them sacrifice their childhood fun is hard.

There's a range of what people are ready to give up. I would say I'm on the better side of it, but it's still not enough. Almost no one is ready to sacrifice, and we need almost everyone to sacrifice. Governments do lip service to these goals, but let's see how much countries like Spain sre ready to curb tourism, or countries like Germany and China that live off manufacturing to cut consumption. Who will give up their job to reduce carbon emissions?

The saying train wreck in slow motion has merit.

Somebody (maybe Stalin) once said something like one death is a tragedy, a million is a statistic. A disaster on the scale of millions of deaths doesn't register in a lot of people's brains. It has to be made smaller, more personal.