According to Deutsche Bank Climate Change Advisors in 2010:
We are seeking to raise public awareness of climate change. As investors, we know the importance of measurement so that we can track progress. Our approach is to start by understanding the quantity, or concentrations, of long-lived greenhouse gases which are building up in the world's atmosphere and are leading to global warming. We have turned to key scientific sources to calculate the current atmospheric concentrations of greenhouse gases and to monitor how quickly these concentrations are increasing..... On June 18th as the counter started, long-lived GHGs in the atmosphere were estimated to be 3.64 trillion metric tons, growing at 2 billion metric tons per month, or 467 ppm, of which CO2 was 385 ppm.
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Thank you to ClarenceGirl for drawing my attention to the counter.