HELP EXPLAIN THIS

(1) What is the connection between the problem of carbon leakage and competitiveness? Why has this connection provoked debate about the need for border tax adjustments (BTAS) in the presence of carbon taxes? (il) If a coalition of some countries unilaterally introduces climate policy, in the absence of the WTO, what trade policy instruments should the coalition use to prevent free-riding by other countries? Why might the use of such instruments violate WTO rules? (ill) What are the GATT/WTO rules on border tax adjustments (BTAS) for domestic excise taxes? (iv) Carefully explain why the aluminum industry is considered as a candidate for use of a BTA In the presence of a domestic carbon tax. (v) If US and Canadian aluminum firms compete in a Cournot-Nash game in the US market, use the appropriate diagram(s) to explain how a border tax adjustment should be set in order to ensure no carbon leakage occurs if the US implements a carbon tax. Does this policy also restore US aluminum firm competitiveness