What Australian politicians call carbon tariffs, the European Union labels a carbon border adjustment mechanism.
While one sounds bad (the World Trade Organisation has rules that restrict tariffs) the other sounds understandable - if the European Union is imposing a carbon tax on its own products as Australia once did, surely it is reasonable to impose it on products from overseas.
The argument is that if a German steel manufacturer has to pay a tax of, say, $77 a tonne for the carbon it emits while making the steel, an Australian manufacturer should be charged the same when its product enters the country, unless it has already paid the same tax here.
To do otherwise would give the Australian product an unfair price advantage - it would create "carbon leakage" of the kind Australian businesses used to warn about in the leadup to Australia's carbon price.
The European Union approved the idea in principle on March 10.
The details are less than clear, in part because it is possible that carbon tariffs are not permitted under the rules of the World Trade Organisation to which European nations and most other nations belong.
WTO rules might help Australia…
The rules say taxes or "charges of any kind" can only be imposed on imported products the same way as they are domestically.
That appears to mean that they can be imposed on importers but not on producers, which isn't quite what the European Union has in mind.
Ideally the World Trade Organisation would be able to provide guidance, but (in part because of the actions of the US Trump administration) it isn't really in a position to do.
…if only they were enforceable
New World Trade Organisation director general Ngozi Okonjo-Iweala. Fabrice Coffrini/AP
The WTO has a new director general in Ngozi Okonjo-Iweala who took office this month, but it will remain in an "induced coma" for as long as its appellate body is unable to hear disputes.
Under Trump, the US kept vetoing appointments to the appellate body until the expiration of terms of its existing members meant it no longer had a quorum.
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