Asymmetric effects of energy consumption and economic growth on ecological footprint: new evidence from Pakistan.

This study explores the asymmetric effects of both aggregate and disaggregate forms of energy consumption along with economic growth on environmental quality for Pakistan covering the period from 1971 to 2014. We have employed unit root test with breaks for stationary checks, BDS test for nonlinearity check and nonlinear autoregressive distributed lag (NARDL) approach for assessing the asymmetric co-integrating relationships among the variables by decomposing them into positive and negative shocks. The empirical findings for aggregate consumption reveal that only negative shocks have a significant impact on ecological footprint. Similarly, different sources of energy consumption have diverse asymmetric effects on ecological footprint. The positive (negative) shocks to oil and gas consumption increase (decrease) ecological footprint. Thus, an increase in oil consumption has a deteriorating impact on environmental quality while a decrease in gas consumption has a favorable impact on environmental quality. The asymmetric relationships also hold between coal consumption, electricity consumption, and ecological footprint. The positive shocks to coal and electricity consumption are negatively related with environmental quality while negative shocks are positively related with environmental quality.