The days when new carbon levies were deemed too politically impossible to be on the table are well and truly over, says the Financial Times' Pilita Clark. BAKU: United Nations (UN) climate Conferences of the Parties (COPs) have been held for nearly 30 years and, for much of that time, they have included calls for something that has always seemed about as likely as Donald Trump going vegan: New global taxes on shipping and aviation emissions. At COP29 in Baku, Azerbaijan this week, things are

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