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Poster: Doug L
Comment: The explicit purpose of the beaker experiment was to show that it would warm substantially faster if the earth's (sea?) ice melted. Energy content changes in the Earth's ice have been insignificant compared to the measured changes in the ocean during Hansen's so called "Smoking Gun " study which ended at the same time they started getting more accurate ocean temperature data from the new Argo system in 2003.

Hansen's study claimed he had 10 years of precise data. The publicity release with that study when read with the study left the false impression that the 10 years of precise data came from the new Argo system. Since 2003, ocean data show no warming. So now people want to know why it's not warming. It seems like the beaker study is a covert way to explain this all away and sweep untidy facts under the carpet.

Poster: Doug L
Comment: That beaker experiment was inappropriate. No doubt you could have found a scientist to explain that to you. Perhaps that's why both scientists interviewed sounded nervous. They won't be receiving such uncritical reporting for the rest of their careers.

Poster: Carl Johnson
Comment: Your program on oceans-climate-change was excellent, as usual. I am a Research Physicist who has worked in that field for some years. My comment is regarding the "ice cube demonstration" that Ruth Curry did. That demo is certainly correct and excellent, but it is incomplete. Around 5 years ago, I discovered that the body of the Earth's Crust has such low thermal conductivity that the Earth acts much like her ice cubes do. I had done all the calculations and found that the slowness of heat flow through the Crust causes around a 140-year lag in any rapid average temperature change of the Earth. I even found good evidence of that, such as where carbon dioxide released around 1860 was significant, and that appears to be the primary cause of the one or two degree temp rise that we have measured so far.

The point being, the massive additions of carbon dioxide that we are now doing will have a delayed effect, much like Ms. Curry's ice cubes caused, but of specifically around 140 years, and due to the "coldness" of the Earth itself regarding sudden changes.

Poster: Chris Collins
Comment: The ice in the beaker experiment is flawed and overly simplistic:
1) Using a hot plate to represent the planets' temperature rise is a gross misrepresentation of the process of global warming.
2) There was no attempt to match the ice-to-water ratio of the polar icecaps and oceans.
3) The percentage of fresh water and salt water oceans and their specific densities were not considered, therefore proper heat transfer rates could not be represented.
4) It does not take into consideration global rainfall or freshwater inflow from rivers

Poster: Chris O
Comment: I just watched your piece on global warming and ocean warming. Ruth Curry is using 10th grade science in an attempt to explain a extremely complex system...the ocean. I am an engineer and anyone who takes thermodynamics class can reproduce the experiment she performed. The differences between her experiment and the real life ocean and polar ice are so numerous that it is not even worth getting into, however I am very disappointed that you did not interview a thermodynamic modeler to assess the differences in her experiment and the actual ocean. Her theory would be blown to pieces, but as you know however, to the average person her experiment makes perfect since. It is shameful of you to put forth such conclusions without an opposing view. In fact the whole issue of global warming has been oversimplified and is not explained fully by any theory on the books. Every theory has holes in it. In fact, if the opposing view was shown the science against "man-made" global warming is more scientifically sound then the current theories that attempt to explain global warming. Your piece is appalling and makes assumptions on science that are not absolute. Please do better in the future and explain all sides, no matter how unpopular it makes you!

Poster: Craig A. Moore
Comment: I just watched the global warming segment on PBS NOW and have to attribute much of it to stupidity through simplicity. The heating of the water with ice till the ice is gone and showing that is going to bring the end of all is a wrong. Statistics can show anything. Back in the 50's and 60's you can statisticaly prove Coke can prevent polio. As the sales of Coke went up, summer time, the level of polio declined. Fact was, as the sales of coke went up, everyone was going outside more often because it was hot and those going outside were less likely to transmit or catch polio. Back in dinosaur time it was very hot and humid, global warming gone wild. What did the dinosaurs do that caused that at that time? What could they have done that may have prevented that from happening. Wait, they died off because the worlds climate changed, what did they do which killed them off?

Poster: Sophia Facciabella
Comment: Re: Your program on "Ocean Tipping Point" - Putting a stop to or even lessening the rate of global/ocean warming won't be possible without stopping the worldwide exponential population growth, which is really the cause of our ecological and political problems. Yet, politicians, religious leaders, media moguls

Poster: Frederick
Comment: If the large number of hostile letters to NYT Tom Friedman's brave and very clear call to Americans to support Sen. Waxman's bill to probe global warming and find solutions -- SOON -- is any hint on how far this planet is "tipping" toward global disaster, then we can see it coming. In classic denial, most conservatives read Obama's in terms of more taxes. It's one thing for KBR employees in Iraq to cope with health problems their bosses ignore; it's another, more horrific matter when sea levels rise and farmland turns to dust. I'd like to be optimistic, but I find it hard. Fred Portland, OR

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