I came across a couple of good articles in Edge.org on climate change. The first was a somewhat radical position taken by Freeman Dyson. In his opinion, the effects of climate change are exaggerated and can be mitigated by changes in land management and farming practices such as no-till farming and genetically engineering plants to create more root biomass, essentially increasing carbon stored in soil. He has some especially unkind things to say about computer models of climate change. This brought out a response from Alun Anderson, who invited Dyson to come to the Arctic and take a look for himself. A good give and take. Anderson mentioned that summer melting of Arctic ice has increased and this has resulted in a mad rush by Russia, Canada and Denmark to map accurately the continental shelf bordering their coastline.
What's the big deal about continental shelves? The five countries bordering the Arctic (U.S, Canada, Denmark who administers Greenland, Norway and Russia) have exclusive right over mineral deposits extending to 200 nautical miles from their coasts. This zone can be extended if any country can prove that their continental shelves extend to a distance more than 200 miles. Russia is now claiming just that. It is saying that the Lomonosov ridge which is an underwater linear block of continental crust aligned roughly NE-SW is a natural extension of its continental shelf. Preliminary estimates suggest that the ridge could yield about 10 billion barrels of hydrocarbons.
Plate tectonic theory has been used to explain the geological evolution of terrains, but this is probably the first time it has been called upon to resolve a brewing political crisis.
In early Tertiary period (about 50 million years ago) the north Atlantic spreading ridge propagated northward (dotted purple line and arrow). This cause the continental shelf of Eurasia to rift and split apart. This rift evolved into a oceanic spreading ridge known as the Gakkel ridge (spreading shown by yellow arrows). The Lomonosov ridge is a linear block of Eurasian continental shelf which split and moved NW to its present position. Russia asserts that its Siberian continental shelf extends naturally as the Lomonosov ridge. The point of contention is highlighted by a red arrow next to the label Russia. Is there is geological continuity of terrains there? Plate tectonic theory suggests that the ridge was moved there into position and juxtaposed against the Siberian shelf. Recent seismic data show that as the ridge approaches Siberia it deepens and there are buried faults in the deeper sediment between Siberia and the Lomonosov ridge, a finding that supports tectonic theory. Denmark and Canada can probably make a similar claim on it's side of the Lomonosov ridge.
But why should that matter? Currently reality should take priority. Even if the ridge was originally somewhere else and stuck on to the Russian shelf later by plate movements, doesn' t that make it a natural extension of the Russian shelf. The law of the sea doesn't say which type of geological process should cause the extension of the shelf. I have a feeling Denmark will also be able to show that the Lomonosov ridge is attached to their shelf. As warming clears more Arctic ice, plate tectonic theory will have plenty to say on the complicated energy politics of the Arctic ocean.