Ocean acidification may present one of the gravest threats to our planet’s ecosystems and yet it is also one of the least publicized aspects of the global climate change issue. Acidification is occurring very rapidly, causing unprecedented changes to the chemistry of the oceans. It’s been estimated that roughly half of human-produced CO2 emissions over the past two centuries (since the beginning of the industrial age) have been absorbed by the oceans, leading to a drop in ocean surface pH of nearly 0.1 units (on the logarithmic pH scale).
 Coral Reef in Timor (Photo courtesy of Nick Hobgood) |
Until that tranquil morning in late June 1974, the sum total of my SCUBA diving experience had been in a landlocked state, in a stifling, moldy indoor YMCA pool in the Philadelphia suburbs and a Pennsylvania quarry, flooded with icy soup-green water. Barely comprehending the new world of pungent humidity, mountainous afternoon cumulus clouds, and lush tangles of flowering succulents I experienced at water’s edge during my first visit to the Florida Keys, I was wholly unprepared later that morning when I found myself seated in sugar-white sand with 40 feet of warm, clear aquamarine water above my head. As impossibly multi-colored fish passed slowly within reach before my wide 15-year-old eyes, my gaze broadened as I marveled at the towering jetties of coral around us, living layer cakes of corals upon corals, brown and mustard rock-like structures, encrusted with brilliant red, violet and orange coralline fans and branches, swaying in the warm, nourishing current and, like eager spring blossoms, reaching toward the dancing sunlight scattered on the surface above. 
