Exactly, it's about 50% more than it was when humans evolved and adapted to the climate.
Global median earth temperature can quite easily be calculated by CO2 in the athmosphere:
0,03% CO (300 ppm): 13.40 C
0,04% CO (400 ppm): 14.64 C
0,05% CO (500 ppm): 15.61 C
The effect is tremendous, without CO2, as in level 0,000%, global median temperature on earth would be 11.3 C.
So maybe you can see now that 0,03% make quite a difference, and so does every 0,01% more.
The effects of 2 degree might still seem neglectible to you, but it means catastrophic outcomes for global food supply, local weather catastrophes, and pretty surely global climate wars with billions dying in this century as the result.
Venus for comparison has 96.5% CO2, it's temperature is 464 C, without CO2 it would be 46.5 C.