Dense, supercool highly saline water comes from beneath the ice sheet. There are wonderful videos of the effects of dense supercooled water sinking to the polar ocean floor and instantly freezing the numerous animals on the ocean floor. Polar precipitation leads to dilute low density surface water which freezes more readily as the semiannual polar winter progresses. Thank heavens we do not live on a planet that runs on models, but instead runs on physics, and unpredictable chaos.

@58:30 Yea, likelihood of wars rises when natural resources like food and water dwindles. Losing coral reefs means 1 billion people are our of job and food. That amount of people that are seeking something else will make many areas unstable. Places where sea level rise wil hit are yet another. Already in Florida people are starting to see this and they are migrating away. Mass migration from dried conditions in Africa and Central America has pushed people away. And have created multiple conflicts. And are rising hatred against refugees. If things go wrong we may even accelerate our own doom by starting nuclear war over climate driven issues.

Myles Allen is always very clear. So the ocean overturning is slowed by more rain towards the poles. The rain must be drawn from more southerly oceans for this to be an issue. Clearly as warm air travels north it reaches a due point after which there is no more precipitation. So the question is how far on average the moist air travels. If the overturning takes place and the weather cools then the due point will move south again. Has the possibility of a self regulating system been eliminated from the range of possibilities? Also less rain in the Amazon which is Tropical. How does this square with increased tropical evaporation going to the poles? Next question: If moist air is moving to different locations do the ocean currents affect the wind - trade winds and so on? My guess is yes. To my mind still more work to be done on all this.

Except that William Happer has calculated that CO2 is significantly non-linear: he states that doubling CO2 will not double its contribution to temperature rise. If Happer is correct, why do the models show a linear temperature rise?

Thanks a lot for the geophysical explanation; I didn't know that before.

Very clear præsentation. Perhaps I missed it, but I would have liket to hear a word on the recent Dithlevsen/Dithlevsen article on the AMOC.

Thank you for such an accessible (for a non-physicist) presentation. Look forward to the next one.

Unhelpful does not mean incorrect. We can still help, it is too late to stop!

Greetings from Scotland. Snow overnight, lasting into the morning. The bus and cars couldn't get up the hill. Heavy sleet / rain in the afternoon. But that'a just weather isn't it ?

Could we harvest the melt water? Build water pipelines to some of the major reservoirs? Would that reduce some of the sea Ievel rise and other issue's? Such as temperature, current and salinization levels? I know that it sounds like a nearly impossible feat with logistics and cost but I would say that our survival is priceless.

Excellent presentation! Wish I could be as optimistic as Myles.

last month was the hottest on record here in Florida

What about the effect of the increase in water distillation and the increase of salinity in the waters around the coasts especially in the Mediterranean?

And it has been for the last 20 thousand or more years!...back then the ice was a mile thick over chicago.

Opening sentence, “ net zero “ was mentioned. That recent, duplicitous phrase that can mean anything you want because it’s effectively dishonest accounting. Great start. Watching and waiting for redemption.

Sorry to point out another error, but modern geological thinking has the drainage of Lake Agassiz as causing the 8.2 event at 8,200 years ago rather than the Younger Dryas. This might actually help your argument as no AMOC collapse occurred at that point. The 'recent' AMOC switches relate to the DO events within the glaciation period.

At one time the poles had no ice

“I accepted to come to this meeting to have a sober and mature conversation. I’m not in any way signing up to any discussion that is alarmist. There is no science out there, or no scenario out there, that says that the phase-out of fossil fuel is what’s going to achieve 1.5C.” - Sultan Al Jaber, President of COP 28, also CEO of Abu Dhabi National Oil Company Mukhtar Babayev will be the president for COP 29; he is also a former executive of the State Oil Company of Azerbaijian Republic. Seems more and more likely, scenario SSP5-8.5 of the IPCC assessment may come to fruition (or at least the higher end of the spectrum). I say enjoy what you can, while you still can; pity the generations to come.

We have time to act, but not time to waste. Also I think we can mitigate the worsening of it in general, but 'fix it', is idealistic. We can make the best of a bad situation, by trying to do our best, but we can't return to a 'fix' of how it was before carbon. So let's make the best go of it, for what it's worth in regards of that, and not give out/give up

0.8 Celsius / 50 year... It is un unmeasurable...

Stage lights up!

even if it would get colder there is a natural max to the height a glacier can reach, if it grows to much it will collapse and push itself to the ocean.. all due to gravitation and the properties of polar ice.

Surprisingly, i remember something dimly from old lectures.

How can you have a Tipping Point if Heat is always Temporary, Night Time is always cooling, Winter is always freezing, No Tipping Point Possible.

Global Ocean Circulation: Antarctica . Two DIFFERENT things happen in this region. The surface water driven north as shown "pulls" deep water below south to Antarctica at depths 200m to 800m or thereabouts (so below the 0m-200m, roughly surface water being driven north above by the wind). That's a simple local overturning cycle of 200m-800m warm (0-2 degrees) water coming in, melting 2.3 trillion tonnes of ice per year off the Antarctica ice, freshening, getting "light", rising to surface because it's light, cooled to about -1.8 degrees and driven north (*so it came in at 1.0 degrees, cooled to -1.8 degrees, melting ice, rose to surface and wind drove it north. --------- Separately, the vast high--pressure, cold, salty water pumps (like pile drivers) at locations around Antarctica force water under increased pressure to the sea bed at -0.5 degrees northward up all oceans at a huge flow of 25.8 Sv and travel the sea bed at 0.0 degrees lifting the entire global ocean depth of 5,800 m above them by their high force except that the force is withheld in North Atlantic by the same thing around Greenland (the AMOC force and 17.5 Sv flow) with a Mexican Standoff at the Atlantic equator and this Antarctica AABW denser water then lifting the Greenland AMOC LNADW-UNADW to the surface further south (like a crowbar wedged under it). Arctic Ocean is a tiny paddling pool not an ocean and the 25.8 Sv AABW from the Antarctica vast high--pressure, cold, salty water pumps lifts the rest of the global ocean by about 2.7 metres (9 feet) per year. The permanent thermocline is only 650 m deep and temperature 5.0 degrees at the bottom, 27.0 degrees at the top, the lowest 89% of ocean 650 m down to 5,800 m deep is 0.0 degrees at the bottom and 5.0 degrees at the top so this vast area of "warm water lens" is literally lifted by being wedged up underneath by 2.7 metres per year which entirely replaces it with nice new 5.0 degrees water once per 650/2.7 = 240 years (of course, the sunshine and various mixings warm the water as it rises). That's called Global ThermoHaline Circulation (THC) or "Global Ocean Conveyor" and an old bloke "Wally Broecker" invented it using a giant stirring spoon and got a big bowl of pancake batter dumped on his head when he crossed the Pacific Equator. Serves him right.

Planet Earth is suspended in Space where the temperature is minus 273 degrees Celsius . The world remains in an Ice Age .❤

How can you stop night time freezing, nobody explains this.

coral reef recovered 2022

Is starting off at 1900 a mere 100 yrs , just a blink ?

Nature is not linear, nor are tipping points, and graphs are full of squiggly lines as global heating is definitely moving at an accelerating rate and we are already beyond the 1.5 C. This discussion is behind the science and times, particularly if you consider aerosol masking and earths energy imbalance.

Is your argument about crying wolf to often ?

5:20 ah, those Grauniad yellow labels, warning the reader to check whether we are currently at war with Eurasia or Eastasia right now, and that the article may not follow the most up to date form of Newspeak.

Every time I see a sub surfacing in the Arctic I see plenty of thick ice and cold temperatures are reported so it makes me wonder if the people who say the place is melting are in a nice air conditioned office in NYC!

20,000 years ago where Lake Erie is currently located the ice was up to a mile thick, it reached south nearly to the Ohio River.. The Earth's population was estimated to be 5 million hunter gathers, their main fuel was wood. How did that ice melt in a blink of Geologic Time? Asking for a friend.

Let the war industry with their nifty machinery turn to geo-engineering in the heavens.

You are correct, Tony Blair did use hyperbolic language. These last 17 years could have been used to really pump up the global temperature and not scream about the encroaching disaster. As a lifeguard, i wait for the swimmer to be unreachable and beyond saving before I raise the alarm.

I'm not worried about tipping points. They're all going exponential much sooner than expected. Like most aspects of the climate crisis.

AMOC is most likely the last tipping point to take effect and therefore the least worrisome of them all. By the time the AMOC collapses we will be long gone. Consideration of habitat, food production and the heat stresses on all species are much more valuable studies of climate change than the circulation of the oceans. Now if you want to talk about fish die off, I would take your lectures more seriously.

How are people like Randall Carlson so sure about what he thinks about climate change as opposed to this guy? Does Randall Carlson know something this guy doesn't or vice versa?

Seems to be a lot of "coulds" in this message.

" i do remind people, that less than the what we paid for gas lasy year less than the profits everbody made of gas we all paid for gas we could have captured it all the CO2 it generated up and put in under the north sea twice over last year"" is this accurate?

We need more warming. It would be wrong to try to stop it. Our current climate is what we're used to but is hardly optimal.

When it comes to being carbon neutral the world needs to help islands like hawaii with their old vehicles. Right now people tend to burn old vehicles because that’s the only way they can get the junker towed by the government to be disposed. Thousands of island cars just bursting into flames. Sad that there’s no other alternative for people. As well there are tons of old cars with gaskets that no longer can keep oil from leaking out of the car.

Global Ocean Circulation: Antarctica . I disagree with Lynne & the lady. Two DIFFERENT things happen in this region. The surface water driven north as shown "pulls" deep water below south to Antarctica at depths 200m to 800m or thereabouts (so below the 0m-200m, roughly surface water being driven north above by the wind). That's a simple local overturning cycle of 200m-800m warm (0-2 degrees) water coming in, melting 2.3 trillion tonnes of ice per year off the Antarctica ice, freshening, getting "light", rising to surface because it's light, cooled to about -1.8 degrees and driven north (*so it came in at 1.0 degrees, cooled to -1.8 degrees, melting ice, rose to surface and wind drove it north. --------- Separately, the vast high--pressure, cold, salty water pumps (like pile drivers) at locations around Antarctica force water under increased pressure to the sea bed at -0.5 degrees northward up all oceans at a huge flow of 25.8 Sv and travel the sea bed at 0.0 degrees lifting the entire global ocean depth of 5,800 m above them by their high force except that the force is withheld in North Atlantic by the same thing around Greenland (the AMOC force and 17.5 Sv flow) with a Mexican Standoff at the Atlantic equator and this Antarctica AABW denser water then lifting the Greenland AMOC LNADW-UNADW to the surface further south (like a crowbar wedged under it). Arctic Ocean is a tiny paddling pool not an ocean and the 25.8 Sv AABW from the Antarctica vast high--pressure, cold, salty water pumps lifts the rest of the global ocean by about 2.7 metres (9 feet) per year. The permanent thermocline is only 650 m deep and temperature 5.0 degrees at the bottom, 27.0 degrees at the top, the lowest 89% of ocean 650 m down to 5,800 m deep is 0.0 degrees at the bottom and 5.0 degrees at the top so this vast area of "warm water lens" is literally lifted by being wedged up underneath by 2.7 metres per year which entirely replaces it with nice new 5.0 degrees water once per 650/2.7 = 240 years (of course, the sunshine and various mixings warm the water as it rises). That's called Global ThermoHaline Circulation (THC) or "Global Ocean Conveyor".

I'm not Doomer, I'm a Doomalist.

As green house gases continue to accumulate, and the world warms, borel forests will increase burn rates and spread soot over the Arctic, and as the Arctic Ocean warms methyl hydrides, and other organics bound in permafrost will release more CO2, and CH4, and will lead to positive feed back.

Polar ice melting gives us the opportunity to explore new territories and search for more resources.

The circular reasoning offered by the speaker is insultingly shallow.

According to Greta's word in 2018, the tipping point should have been happening within five year after her comment. Prophets of doom!

Maybe Tony Blair was right and we did pass some tipping points already. The Antarctic sea ice has clearly entered a new state. Fire behavior and high temperatures are clearly in new states. I would not be so quick to dismiss Tony Blair’s prediction just because his deadline has passed.

Watch: climate the movie "the cold truth"

1.During Roman times the earth was as warm as today. temperature anomaly .1 2. During the dark ages, the world became colder temperature anomaly -.4 3. Medieval ages 1000 years ago temperature anomaly .2 4. Little ice age 1700 temperature anomaly -.7 5. Today temperature anomaly .1 From Climate The movie

All those straws.

Is this 3 days old really ? Fact check ! Did we just pass 2'c ? Check ....... Yes we did temporarily Did the interviewer contradict himself ? Yes he did on 3 occasions Have we actually made progress on reducing our emissions ? No we still increase emissions by 1.5% annually Is he confident and does he actually believe what he is saying ? No he is not and does not. Does he state and believe temperature is increasing faster ...... Yes he does

blue kachina is here now and they will not change their ways so the blue will bring the red kachina to reset mother earth Mother earth will move A ho

If is too late. It was too late 10 years ago. This guy just hasn't woken up.

Guy McPherson has the courage to tell the truth. And no he is not working for Exxon.

Jolly hockey sticks!

Uh. We’re coming out of an ice age so duh. What do you think we can do to stop an inevitable change in climate? Move away from the coast lines, flood plains and fire hazards. That’s all you can do.

I hate his word whiskers. I’m. Um. Um .

If you don’t wanna give it then shut up

Algo b-b-boost! Plaza Del Rey Plaza Del Rey

Just another money rip off WEF A loas of bollox

How to confuse a subject. Lol

"We" or "Everybody" must be a terrible person, it seems. I'm "Me". I don't even have a car and live in a normal 7 story building, and I don't pack 10 fridges, cause I have stores nearby. So talk about your own energy footprint. And nuclear winter is 1000 times more probable than "a boiling planet". And really depends on "We" to prevent it.

7:00 -- This graph is only 100 yrs old ... Useless in the climate changes the earth has experienced in it's 4 MIL yr history ...

Okei, mr. Allen, climate preaching might still be profitable, there is nothing wrong with that, because only the fools come listen and loose their money, they defenitely deserve it, nice.

Change the record.

His lip-smacking is so loud and distracting. I quit.

I listened for twenty minutes. He showed a graph where someone in the 70’s predicted large warming in the decades to come. I gave up. I’m tired of catastrophic predictions that never come true. The prediction from Tony Blair that he quotes is a perfect example of why we shouldn’t believe him. Yet he strangely tries to use Blair’s lies as support for his own argument. Weird.

Yawn

idiotic nonsense.

A private college going for this kind of popular WEF propaganda? A tipping point for me, I unsubscribe!

The earth will last, forever, it was made for a purpose. ‘World without end’.

I have watched so many VERY dubious ideas being espused as fact on this channel I have stopped watching Grasham College. I know enough to avoid working with people who have received their education there.

Stop lying.