The grey steel girders of Platform Holly rise 235ft (72m) above the waters of the Pacific Ocean, just a couple of miles off the Santa Barbara coast. Above the water, this decommissioned oil rig is dull and lifeless, but the view below the surface is very different. Beneath the waves, colourful fish, crabs, starfish and mussels congregate on the huge steel pylons, which stretch for more than 400ft (120m) to the ocean floor.

There are more than 12,000 offshore oil and gas platforms worldwide. As they drain their reservoirs of fossil fuels below the sea, they eventually become defunct when they produce too little fuel for extraction to be profitable to their operators.

The big question is what to do with these enormous structures when the fossil fuels stop flowing. With curbing climate change rising up the international agenda, and with some questioning whether we have already passed peak oil, hastened by the coronavirus pandemic, the number of defunct rigs in the ocean is set to get bigger. Removing them from the water is incredibly expensive and labour-intensive. Allowing them to rust and fall into disrepair is an environmental risk that could seriously damage marine ecosystems.

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Source: BBC

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