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It is often suggested that we can fight climate change by capturing CO2 and pumping it underground.
This is simply not practical in terms of scale and cost.
For example, CO2 is at 420 parts per million. We need to eliminate much of this to return to safe levels.
What is the cost of capturing 1 part per million? One ppm weighs 8 billion tons. Current low end costs are $300 per ton.
So, the cost of capturing 1 ppm is $300 x 8 billion, or $2.4 trillion. And it goes up 2.5 ppm per year.
These are hard facts, but success does not result from wishful thinking.