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Seriously?  Ok.  Build a greenhouse.  Set up a thermometer inside.  Close all the doors and windows so that the air is trapped inside.  Measure the maximum rise in temperature due to heat absorption by the air and surrounding structure.  This is your baseline reading for experimental purposes.  Now add 108 ppm of CO2 into your greenhouse (the amount of CO2that Man has added to the atmosphere since 1750).  And then measure the rise in temperature.  The difference between the baseline temperature and the temperature result after adding CO2 is the the amount of heat energy which is absorbed by the CO2 and added to the system.  This is a very simple experiment than anyone can conduct, and in fact has been conducted for decades with very reliable results.