Name the principal greenhouse gas whose atmospheric levels have registered a steep hike in the past 4mn year ?

only serious answers

The unavoidable water vapor and CO2

Carbon di oxide
CO2. Here's some data:
The exponential curve for Mauna Loa CO2 is
310.454^1.004(t-1958) with t in years. It is hardly a steep hike. It is a 0.4% increase per year or, if you want to commit the error of extrapolating from insufficient data, a 50% increase in 100 years. You can distort the graph by taking the vertical scale only from the min to the max of the data and compressing the horizontal scale to make it look like a steep hike, which is what you would get if you graphed this 48-year spread of data on a million year time base.

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