Table 5.

Unit root testing.

Variables	Augmented Dickey-Fuller
	I(0)	I(1)
MI	−1.6100	−1.6122*
GHG	1.248	−2.2241**
GDP	−1.546	−4.551***
GE	0.1612	−1.661**
RQ	1.764	−2.5431**
GHE	−0.0076	−4.431***

Significance is indicated by 10, 5, and 1% through *, **, and ***. I(0) is for level, and I(1) is for the first difference.