Carbon tariff trade war?

Here.

Excerpt:

Tracking carbon inputs in any product is an impossible task, a nightmare of measurement and calculation that would require a massive bureaucracy at the World Carbon Trade Measurement Agency and tie up carbon trade negotiators for decades, assuming no trade war intervenes to crash the world trade system. An example is beer: Canadian beer would benefit if European beer faced a carbon tax on transport costs from Europe. But Canadian beer might use hops and other inputs that have to be transported across Canada. What kind of electricity and water sources are used in each location? Would carbon tariffs become a protectionist policy favouring Canadian beer?