Vielversprechende neue Ansätze zur Kohlendioxidentfernung, die alle auf Ozeanen basieren.
Will stashing more CO2 in the ocean help slow climate change?
Vielversprechende neue Ansätze zur Kohlendioxidentfernung, die alle auf Ozeanen basieren.
Will stashing more CO2 in the ocean help slow climate change?
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Land-based CDR, including planting trees, restoring coastal ecosystems and building facilities that directly capture CO2 from the air, can get us part of the way there, Kitch says. But all of the carbon uptake from land-based approaches would add up to only about 10 billion tons annually, Kitch says. Such calculations need to ensure sufficient land area for food, water and biodiversity preservation, she adds. “That gets us to 2050, but what about beyond that?”
That’s where the ocean comes in. “The big advantage of the ocean is its capacity,” Kitch says. “The ocean can store about 19 times the amount of carbon that can be stored on land.”
There are a few basic ways to enhance the ocean’s current carbon uptake: Increase the ocean’s abundance of photosynthesizing organisms, increase the water’s alkalinity so it can absorb more acidic CO2 and build huge facilities at sea that suck carbon directly out of the water.
The Ocean is already the biggest carbon sink in the world absorbing roughly 1/3 of all human-caused CO2. If it continues to absorb higher amounts of CO2, it will become more acidic which is already happening. This will prevent shellfish from being able to produce shells resulting in a collapse of the food chain and likely mass extinctions in the oceans and on land. We have some mitigation strategies to deal with this risk such as increasing kelp fields to absorb the CO2 and store it in the dead leaves as sediment locking the CO2 out of the water but for it to be sustainable we need to reduce the overall amount going in just like we do for the atmosphere. Subsequently, we may be able to store more in the ocean but avoiding the tipping point in the water may be as tenuous as trying to do it in the atmosphere.
My understanding at least.