Hello Everyone.

I have a dataset with different variables.

I used the ADF to check for stationarity and got the following results. After first difference GDP remained non stationary. While other variables changed from non stationary to stationary or maintained the stationary status (I include a table of the status)
VAR At Level First difference
lco2 non stationary stationary
lgdp non stationary non stationary
lpopd stationary stationary
lpops stationary stationary
lfdi non stationary stationary
How do I proceed with this. I can't run the VAR cause this can only be run if variables are integrated at order 1. I also believe that I can't run the ARDL since I have a variable (gdp) integrated at order 2.

Thanks.