Diatoms are one of the most common types of phytoplankton.

Climate change isn’t just warming the atmosphere, it’s also warming the ocean’s surface and deeper levels of the water column. This is known as the pelagic ocean (the “pelagic zone” is any part of the water column other than that at the sea floor) and it just so happens to harbor the most productive ecosystem on planet Earth. The pelagic ocean is responsible for an estimated half of the world’s primary production (i.e., the basic food or nutrient making needed to sustain other life), and sustains most of the world’s natural fisheries.

The pelagic zone also plays a very complex but important role in the global carbon cycle. Inorganic carbon (mostly in the form of CO2) can be “drawn down” from the atmosphere by two main processes: the respiration of photo-synthetic algae and plankton (which produce oxygen and serve as a food source as well), and, secondly, the sedimentation of carbon (in the form of sinking, dead marine matter) onto the sea floor. Most algae and phytoplankton have chlorophyll and live in the upper most layer of the water column where there is sufficient sunlight penetration (this is called the euphotic zone; from the surface down to 200 meters is the epipelagic zone). Although carbon is also removed via “outgassing” (the exporting of carbon and carbon-based molecules into the atmosphere via ocean-air circulation), these two processes keep carbon out of the atmosphere. And of the two, bottom accumulation (via sinking) is the predominant means by which carbon is removed from the water column.

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Diagram of a typical Prokaryotic microbe

At some point in the geologic history of this planet, primitive, unicellular organisms (prokaryotes) emerged and proliferated. These primitive microbes were able to harness the Sun’s energy and convert it to food. The metabolic “waste product” of this photosynthetic (light-making) activity–Oxygen (O)–filled the Earth’s atmosphere over the course of vast time scales. This is sometimes referred to as the Great Oxidation Event (GOE).  This geologically long event enabled the “explosion” of oxygen-breathing life forms in nearly every environment where it was present.

However, the precise date (within a few million years or so) of this event has been a point of contention amongst scientists for decades. Most have held that such life did not emerge until (no earlier than) 2.4 billion years ago. A few have radically asserted an even earlier date of nearly three and half billion years ago.

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A common garden slug, Arion lusitanicus, eating (note: the subject of these experiments was a sea slug) photo credit: Håkaan Svensson, Xauxa

After two weeks of a strict algae-only diet, a one-inch, green sea slug species (Elysia chlorotica) was somehow able to incorporate the plants chloroplasts (the cell-like organelles that trap solar energy and convert it to sugar), and then live out the rest of their single-year lives without eating.

The slug, a snail-like mollusk without a shell, was able to photosynthesize, just as plants do. Scientists are not sure exactly how it is able to pull this trick off, but they do know that the slug is able to harness the DNA found within the alga’s chloroplasts (note: chloroplasts in plants are like mitochondria, in that each has its own DNA apart from the DNA found in the cell’s nucleus). But this DNA only encodes a small percentage of the genes (and their proteins) needed for complete photosynthesis. The rest of the needed genes (in particular the nuclear osbO gene) are in the algae cell’s nuclear DNA. Not to worry, somehow, the slug is able to “steal” those genes as well, and incorporate them into their germ line cells–allowing them to pass this new capability on to their off-spring.

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In this satellite image of deforestation in Brazil, tropical rainforest appears bright red, while pale red and brown areas represent cleared land. Black and gray areas have probably been recently burned.

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But planting new trees in a deforested area takes time - years.  The earth’s atmosphere needs a more immediate solution.  This is why researchers at Berkeley Labs in California are working on recreating the photosynthesis process - and are half way there as they have been able to duplicate the first step - breaking up water molecules by using photons found in sunlight.  Nano sized crystals of Cobalt Oxide - a photo reactive metal oxide catalyst, have been found to do the job more efficiently than Mother Nature herself!  

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Researchers at Massachusetts Institute of Technology (MIT) have discovered a new way of storing energy from sunlight that could lead to ‘unlimited’ solar power.

The process, loosely based on plant photosynthesis, uses solar energy to split water into hydrogen and oxygen gases. When needed, the gases can then be re-combined in a fuel cell, creating carbon-free electricity whether the sun is shining or not.

According to project leader Prof. Daniel Nocera, “This is the nirvana of what we’ve been talking about for years. Solar power has always been a limited, far-off solution. Now, we can seriously think about solar power as unlimited and soon.”

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