Climate change

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Stephen hawking says that if the polar ice caps melt (I think this means fully melt) then the resultant release of co2 would increase the climate to 250 degrees Celsius.

I am assuming this must be true. It was in his book, brief answers to the big questions, but the quote does not reference how this has been calculated, not what paper the fact is drawn from.

I had no idea that if the ice caps totally melt, the world would be entirely uninhabitable and basically dead. I feel like this needs to be more known about? It's the way he casually writes it.

Ah right I get you now. Thankfully not everyone is consumed by misanthropic nihilism or laziness.

Wonder why the word ‘woke’ is so triggering for the woke.

Jesus, the same people who misuse woke also misuse triggering. And Inclusivity and Woman and Essay and Hypocrite and News.🙄

I know its old fashioned but I do wish people would use the correct words for stuff.

I forgot to mention Cancelled.

The climate has been warmer than it is now. Both in ancient ancient times and in (say) Roman times. The Romans grew grapes in northern England. Good luck with that now.

The climate is in constant flux. The earth is a living thing.

I'm not saying that big companies should be putting chemicals in the rivers (they shouldn't), but the whole co2 thing is nonsense - especially the idea that us little people making big sacrifices will make any jot of difference.

For one thing, there is a gas seam in Turkmenistan that mankind managed to set on fire decades ago. It it is still burning and emitting god knows how much co2 each year. There are Victorian coal mines that are still smouldering underground from over 100 years ago. But that's all fine apparently - no one cares about that co2. Or the co2 from billionaire's yachts. But the co2 you emit from living your life - now that's killing the planet....................

Global action to date has likely been sufficient to prevent ‘apocalyptic’ climate change in the near future.

Humanity will survive, it’s more a question of the degree of shitness it will have to endure.

🤣😂 No it’s not true. Hawking was a decent physicist, but he was no climatologist. 250C is more than double the boiling point of water. The Earth’s

In addition, the last time we definitely had no polar ice, was the Cretaceous period when dinosaurs roamed the Earth (plus crocodiles). The average temperature was 23C which is 8C above the 15C average that is our baseline. We are trying to limit the average to +1.5C , but that’s not likely. But as you see there is a lot of wriggle room to stop climate change before getting as hot as it was in the Cretaceous period.

That’s not true on a global level. Regional variations exist but, on a global level, the planet is now hotter than it has been since the dawn of human civilization, and will get warmer.

You replied very quickly, didn't you? So glad we have "experts" watching threads like this to jump in and give us their "facts". Reminds me of 2020........

Tech is what is saving us. Going backwards would be the worst thing for us and the planet.

It cant. We’d have to be way waaaay closer to the Sun to end up like Venus.

The solution to climate change is to STOP having children. We need to accept that vast areas of the planet need to be depopulated, as in whole continents

No, that’s not at all necessary. Birth rates are the lowest they have ever been in human history. We will be peaking and then declining by the end of the century, if the trend of the last 100yrs continues. The solution is to keep moving towards a carbon neutral lifestyle.

No, it’s actually ever so slightly cooler now than the warmest it has been during human civilisation, which was the Holocene optimum period 8,000 to 6,000 yrs ago during the Bronze Age.

What the fuck? 😂

Some real nutters on this site.

That’s no longer thought to be true

https://www.space.com/scientists-solve-climate-mystery-holocene-temperature-conundrum

Oops, forgot to put expert on the list.

What's with all the speech marks?

And, for the record, I’m not one.

This!!

Probably wrote it so casually because he had a terminal illness and knew it wouldn't effect him or probably anybody he loved living on earth at that moment.

He wasn't very good at maths anyway.

Sorry but what you posted doesn’t directly contradict what I posted.

It posits a new climate model and simulation that is not a consensus.

What the scientists in this study have done is arbitrarily decided that all the marine samples (taken from 40N to 40S) and dating to the Holocene must have been from the summer. So the high global temperature reflected in these real, concrete samples is the scientists posit seasonal, not annual. They then wrote an algorithm to estimate a much lower winter temperature, took the mean of the two and declared that the lower mean was the actual global temperature in the Holocene.

Im not convinced. I don’t think it is likely that scientists have unknowingly collected tens of thousands of marine samples that all coincidentally were created during a summer 8,000 to 6,000 years ago.

See this more recent study is one of several pointing out that the geological record of fossils doesn’t support the gradual warming, today is the hottest ever model that those scientists constructed with their every sample must have been from the summer concept.
“Seasonal biases (the warm-season contribution) of Holocene mean annual temperature (MAT) reconstructions from geological records were proposed as a possible cause of the mismatch with climate simulated temperature. Here we analyze terrestrial mollusk assemblages that best reflect seasonal signals and provide quantitative MAT and four-season temperature records for northern China during the past 20,000 years. The MAT estimated from the seasonal temperatures of a four-season-mean based on mollusks shows a peak during ~9000–4000 years ago, followed by a cooling trend. In general, the contribution of summer and winter temperature to MAT is significantly greater than that of spring and autumn temperatures. The relative contribution of each season varies over time and corresponds roughly with the seasonal insolation in each season. This independent evidence from mollusk records from the mid-latitudes of East Asia does not support the Holocene long-term warming trend observed in climate simulations and the seasonal bias explanation.”
https://www.nature.com/articles/s41467-022-32506-7