This. Another graph...
From this source.
This does not prove, of course, that the current CO2 levels, at about 335, have only natural and not man-made origins. However, one can see how a certain psychological effect can be generated by "selecting" the last 1,000 years for your audience as opposed to the last 140,000 years. You can tell the truth, but "steer" conclusions quite effectively by how data is presented. Note that CO2 levels cracked 300 about 130,000 years ago.