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The Climate Surprise

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It is clear to anyone who analyzes the graph<br />

of CO and temperature over the past million<br />

years that they are not strongly correlated,<br />

if at all. Even factors that have zero correlaon<br />

with each other somemes move in the same<br />

direcon. During the evoluon of modern life,<br />

CO and temperature have been out of sync most<br />

of the me.<br />

In an explosion of journal arcles, media<br />

reports, and glossy publicaons from environmental<br />

groups on ocean acidificaon began to<br />

appear. A paper published in the journal Nature<br />

said human emissions of carbon dioxide (CO)<br />

“may result in larger pH changes [in the oceans]<br />

over the next several centuries than during the<br />

geological record of the past million years.”<br />

<strong>The</strong> best esmate of CO in the atmosphere<br />

million years ago was – ppm, compared<br />

to today’s ppm. Yet shellfish and corals<br />

thrived at that me. One can only brand this kind<br />

of exaggeraon as sensaonalism—certainly not<br />

science. By , the Natural Resources Defense<br />

Council () was saying that “by mid-century,<br />

. . . coral reefs will cease to grow and even begin<br />

to dissolve,” and ocean acidificaon will “impact<br />

commercial fisheries worldwide, threatening a<br />

food source for hundreds of millions<br />

of people as well as a mul-billion dollar<br />

industry.” <strong>The</strong>refore, not only are<br />

calcifying species threatened, but the<br />

enre web of life in the seas is too.<br />

Let’s examine this hypothesis and<br />

test its assumpons against real-world<br />

observaons and scienfic knowledge.<br />

<strong>The</strong> term “ocean acidificaon” is,<br />

in itself, very misleading. <strong>The</strong> scale of<br />

pH runs from to where is neutral,<br />

below is acidic, and above is<br />

basic, or alkaline. <strong>The</strong> pH of the world’s<br />

oceans varies from . to ., well into<br />

the alkaline scale. It is incorrect to state that the<br />

oceans are acidic or that they will ever become<br />

acidic under any conceivable scenario. <strong>The</strong> term<br />

“acidificaon” implies that oceans will actually<br />

become acidic. It is perhaps just short of propaganda<br />

to use the language in this manner, as it is<br />

well known that the terms “acid” and “acidic” have<br />

strong negave connotaons for most people. It<br />

should also be noted that nearly all “fresh water,”<br />

including the water we drink and fish live in, is<br />

slightly acidic.<br />

More than million years ago, at the beginning<br />

of the Cambrian Period, many marine<br />

species of invertebrates evolved the ability to<br />

control calcificaon, a form of biomineraliza-<br />

on, and build armor-plang to protect their so<br />

bodies. Shellfish such as clams and snails, corals,<br />

coccolithophores (phytoplankton), and foraminifera<br />

(zooplankton) began to combine carbon dioxide<br />

with calcium and thus to remove carbon from<br />

the life cycle as the shells sank into sediments—<br />

million billion tons of carbonaceous sediment<br />

which became chalk, limestone, and marble<br />

(see Figure .).<br />

Coral reefs are widely distributed across the<br />

tropics with the highest biodiversity centered in<br />

Figure 5.1: Representaves of marine calcifying species. Clockwise from le:<br />

coccolithophores (phytoplankton), bivalves and gastropods, foraminifera<br />

(zooplankton) and corals.<br />

25

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