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Observed Atmospheric CO2 Hits 400 Parts Per Million
symbolset writes "Over the past month a number of individual observations of CO2 at the Mauna Loa Observatory have exceeded 400 parts per million. The daily average observation has crept above 399 ppm, and as annually the peak is typically in mid-May it seems likely the daily observation will break the 400 ppm milestone within a few days. This measure of potent greenhouse gas in the atmosphere should spark renewed discussion about the use of fossil fuels. For the past few decades the annual peak becomes the annual average two or three years later, and the annual minimum after two or three years more."
You can't make predictions when a human factor is involved. If we were all controlled by a hivemind and made CO2 decrease our highest priority, stopping CO2 production could be done in 20 years (there's enough nuclear power to sustain our needs, and we have electric vehicles - technologically it's already possible). After that, the oceans would absorb the excess CO2 and bring it below 300ppm in about 300 years (according to a study I sadly can't find now). So absent some miracle like fusion reactors even in a best case scenario it would take at least 150 years to get below 350.
But the most important thing is the human factor which depends on our decisions, and can make that time much much longer.