Ocean acidification: coral reefs are particularly sensible | Photo: NOAA/Creative Commons

Do you know what ocean acidification is? Learn why a surf session might become a dangerous or impossible activity in the future.

Oceans cover 70 percent of the earth's surface. When CO2 from the air is absorbed into seawater, it dissolves and becomes carbonic acid.

Over the last couple of centuries, the oceans have absorbed a quarter of the CO2 we've emitted and their average PH has dropped from 8.2 to 8.1, which means a 30 percent increase in acidity.

As a result, ocean acidification changes the chemistry of seawater and spells trouble for marine ecosystems and the coastal communities that depend on them. Coral reefs are especially sensible to these changes.

Cutting down on the CO2 in the atmosphere is the only way to solve the environmental problem. Because sooner or later we're the ones who pay the bill.

Take a look at a few things you didn't know about the oceans.

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