Carbon dioxide(CO,)itself is not harmful to humans,up to a certain concentration.But the steady increase in atmospheric CO,concentration is causing harm to our environment and threatening human life on our planet in the long term.CO,accumulation in the atmosphere has been through industrial and human activity.CO removal is mainly through biological photosynthesis in plants where the CO,is converted to starchy hydrocarbons.Various mechanical direct air capture(DAC)processes have been developed to simulate the action of plants and remove CO,from the air.A DAC facility rated at one million tonnes of CO,capture per year does the equivalent work of 40 million trees.With such enormous potential,it is no surprise that a tremendous amount of development activity has taken place to research,scale up and commercialise these technologies in the past decade.
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