I am doing a report on whether environmental regulation has an impact on goods exports for the UK (Using difference-in-differences). I have export data from 1990 to 2018 split by SITC codes. However, I was told that if I focus on the SITC codes which are more pollution intensive for the UK in terms of production, it can make my hypothesis stronger and can clearly establish a causal effect. But I am unsure as to how I can find which codes are the most pollution intensive for the UK. Is there any way to establish this properly?
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$\begingroup$ Welcome! Can you clarify the causal effect that you can "clearly establish" by focusing on the SITC codes? $\endgroup$ – emeryville Mar 25 '20 at 23:19
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