Doyoung Park

We study how place-based environmental regulation reshapes supply chains and emissions. Using U.S. establishment data combined with firm-to-firm linkages, we exploit quasi-random variation in Clean Air Act nonattainment designations to estimate the effects of direct and indirect regulatory exposure. Establishments facing regulatory shocks via network counterparts sever ties with regulated partners and face barriers to forming new linkages — yet these network adjustments explain little of the observed emission changes. Establishments lower emissions under direct and supplier-side exposures but increase emissions when their customers are regulated, consistent with stronger customer bargaining power shaping environmental responses under indirect regulatory pressure.

We study the joint roles of global value chain (GVC) positioning — an industry's "distance" from upstream inputs and downstream consumers — and trade competitiveness in determining the intensity of industrial air pollution. Using country-by-industry emissions and GVC positions, we document that emission intensities are mediated by an industry's distance from primary factors versus final consumers, as well as its trade competitiveness. Currency appreciation, by improving import but worsening export competitiveness, can lower emission intensities for industries in vertically longer production networks. The findings underscore how trade policies that consolidate GVC participants toward core positions, or that extend value chains, can complement environmental policy.

We study how trade policy shapes greenhouse gas emissions embodied in agricultural trade, linking structural gravity simulations to country–commodity farm-gate CH₄ and N₂O emissions. Existing tariff preferences raise embodied emissions by 37.9 megatonnes of CO₂-equivalent — about $3.4 billion annually at a recent carbon-border price — with livestock, especially beef, driving most of the increase. A zero-tariff benchmark raises global CH₄ and N₂O emissions by 17.7 megatonnes CO₂-equivalent, driven mainly by trade in crops, especially rice. The results illuminate how the global regime of tariff barriers shapes the environmental consequences of trade.

As U.S. wildfires grow more frequent and severe, the electricity sector has shifted toward solar and wind. Does intensified wildfire smoke, by reducing renewable efficiency, drive up emissions through greater reliance on non-renewables? Using daily precipitation as an instrument for wildfire-related PM2.5, we find that (a) pollution emissions rise significantly on smoke days; (b) the shift from renewable to non-renewable generation partly explains the increase, though elevated electricity demand also plays a key role; and (c) the non-renewable response comes mainly from higher generation levels rather than fuel-mix changes or intensified abatement. The results reveal overlooked environmental consequences of wildfire smoke.