CO2 is a greenhouse gas and to reduce its concentration in the atmosphere, there are three possibilities: We can minimize its production, we can store it and we can use it to make other chemical compounds. Scientists are trying realize all three possibilities to reduce the CO2 concentration in the air. There are several challenges to face, such as to make the 400ppm CO2 content of the atmosphere into usable quantities of CO2 in proper density.

Of course, it would be nice to transform CO2 into "value-added" chemicals, which are for instance methanol, fuels or methane. There are several catalysts that can transform CO2 into these chemicals and research is done to optimize these catalysts for an efficient industrial use.

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