"Could this natural biological carbon cycle be harnessed to absorb more carbon from the atmosphere, store more carbon on land, or use a combination of both to produce negative emissions? Could this be achieved as a positive co-benefit of increasing productivity of crops for food, bioenergy, feed and fiber that the world will need, and thereby be of commercial value?"

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"Twelve hundred "mechanical trees" will suck carbon dioxide from the air as part of a joint effort between Arizona State University and Ireland-based Silicon Kingdom Holdings (SKH). The 1,200 carbon-cleansing metal columns, built by Silicon Kingdom to help put a stop to climate change, would allow for the cheap removal of nearly 8,000 cars' worth of CO2 emissions per year. The technology was invented by ASU's Klaus Lackner, who directs the University's Center for Negative Carbon Emissions."

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"In addition to a reduction of 45 per cent by 2030, Vancouver is committing to a new target of negative emissions by 2050, with an objective of limiting warming to 1.5 C."

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"Project Vesta is a project to remove carbon dioxide (CO2) from the atmosphere and oceans by accelerating the weathering of a type of rock called olivine. When olivine interacts with water and the CO2 dissolved in it, a chemical reaction (called weathering) occurs that creates a bicarbonate solution that marine animals like corals use in their shells. The CO2 remains locked in that form and eventually settles as sediment or turns to limestone rock on the sea floor."

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