Warmists certainly don't. Prophecy is their stock in trade. They're not even good at theory, let alone evidence. One of their more absurd prophecies is that global warming will lead to greater ocean acidity which will dissolve the shells of various marine animals. This is based on the fact that CO2 in water forms carbonic acid. What they fail to mention, however, is that warming REDUCES the ability of water to absorb CO2 -- so warming should in fact make the ocean more alkaline.
Theory is all very well, however. What actually happens in the ocean? Is greater acidity IN FACT fatal for animals living in shells?
Some Russian researchers found out. They were obviously oblivious to global warming. They were in fact looking at concentations of various elements in marine organisms located in proximity to undersea thermal vents (hydrothermal fields). Along the way, however, they did give brief descriptions of the animals they were studying. Below are two such:
The shells of the vesicomyid clam Archivesica gigas are an important target for Ba, Mn, and to a lesser extent of Fe (Figure 3a), however for other metals, they play only a small role. Taking into account the large mass of the shell relative to the soft tissue of clams (in which the former may reach one order of magnitude higher that the latter), we can suggest that shells, which have accumulated trace metals during biomineralization and adsorption, might serve as a great reservoir for many metals. The second abundant bivalve mollusk Leda (Nuculana grasslei) lives on substratum saturated with hydrocarbons (Allen, 1993). Unlike similar species, this animal has an extremely thick periostratum (an exterior part of the shell) that is considered to be an adaptation to functioning in an acidic environment enriched in sulfides. Its nutritional source has not yet been studied completely, but some researchers regard Leda as a symbiotrophic organism containing bacteria in its gills that can combine symbiotrophy with filter-feeding.
So a clam in a very acidic environment was unusually large and had a very THICK shell. The stupid thing obviously can't read what learned Warmists say! Instead of dying, it prospered!
And another mollusk (Leda) also had a very thick shell. Doesn't it know that its shell is supposed to have dissolved away?
What the Warmists overlook is that shell formation is a active process. The shell is not something that just sits there waiting to be eaten away. So even high levels of acidity don't faze the marine animal at all.