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Can Coral Reefs Survive Climate Change?

newtboy says...

The suggestion that reefs might be saved by engineered or selected varieties 'farmed' by humans shows a lack of understanding of the massiveness of the problem. This isn't one, 20 square mile reef, which in itself would be completely impossible to 'reseed', this is the entire ocean.
Also, there's absolutely no way to select for varieties that can still make calcium carbonate in acidic waters, the chemical processes just don't happen, so selecting for heat tolerance only addresses one tiny part of an intricate, multifaceted problem.
I wish I could be placated by the idea that people are working on and will solve the problem(s), but I simply know better.

More studies confirm Calcium still doesn't prevent fractures

MilkmanDan says...

OK, his studies beat my anecdotal bias.

...That being said, I will continue to eat breakfast cereal with milk pretty much every day (as I have since I was very very young), and be strongly tempted to attribute my own lack of having ever broken a bone to that.

The other anecdote I have in my favor is coming from a farm family that raised chickens. I grew up in a prairie grassland area (converted to irrigated farmland thanks to aquifer access), while my cousins lived a couple hours away in limestone hills ranchland. Both of our families raised free range chickens.

Our chickens produced very thin-shelled eggs, and displayed behavior to suggest they were calcium-deprived. For example, our chickens wouldn't cannibalize their own viable eggs, but if we threw empty shells to them they would fight to eat the shells. Same but to a lesser extent for leftover bones, etc. (I assume they fought less over these because bones are harder to near impossible to break down with a beak). On the other side of the table, we sometimes exchanged eggs with my cousins, and their chicken's eggs were always extremely thick-shelled and hard to crack open.

When I asked about that, my folks told me (and later my Biology teacher confirmed) that was because the sod/soil around my home and flora and fauna growing from it contained very little natural calcium. Chickens raised in our area would often be supplemented with commercial feed that contained extra calcium, but we let ours range for food and eat table scraps; almost never supplementing their food with any commercial stuff. But the limestone (aka calcium carbonate) around my cousin's house contained very high amounts of natural calcium, which was naturally infused into the plants / grains / insects that their chickens ate, giving them incredibly thick shells.

So, I guess that while calcium intake apparently doesn't have a very statistically significant impact on human bone growth, I think that it must have a much more significant role to play in egg thickness if you happen to be a chicken... At least if you compare extremes of low natural calcium diet versus extremely high natural calcium diet.

Egg Osmosis (Hypertonic vs. Hypotonic Solution)

GeeSussFreeK says...

Acetic acid (C2H4O2) is what is most likely going to form for the extra CO2 absorption in the atmosphere into the oceans. And just like the egg here, it will dissolve the shells of microorganisms or prevent them from extracting calcium carbonate( CaCO3) from solution (ocean water)

QI - What's The Commonest Metal In The Human Body?

mauz15 says...

Yeah Calcium is a metal, but the inorganic part of bones (bone is 2/3 inorganic matter and one third of organic) is made primarily of hydroxyapatite (85%), which is a crystallized form of the Calcium Phosphate salt. The rest of the inorganic part is Calcium Carbonate, and small amounts of magnesium, fluoride, sulfate, potassium, etc.

Chloride by itself is a deadly gas, sodium by itself is a very volatile metal. But if you get sodium chloride the result is table salt. In the same way, Calcium by itself is a metal and therefore would behave like one, but when it gets together with phosphate in the right combination you get the main component of bones.



>> ^ForgedReality:
Calcium is a metal? O.O Why doesn't everyone set off metal detectors then? How do people work around huge magnets, like in a wrecking yard, without being stuck to them? Why don't bones rust? Why don't bones make sparks when a bone saw is applied? Why in the hell do some people think it's a good idea to put onions in when making a tuna fish sandwich?

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