POLITICO Biden wanted a climate alliance with Europe. He's getting a fight. The European Union’s leadership is set to unveil a proposal on Wednesday to tax imports from countries — including the U.S. — that lack aggressive carbon-reducing policies. Special Presidential Envoy for Climate John Kerry said in March that a carbon border tax would be “a last resort” that could inflame tensions heading into pivotal U.N. climate talks in November. | Francois Mori/AP Photo Link Copied A brewing carbon trade war with Europe threatens to scuttle President Joe Biden’s hopes for cross-Atlantic harmony in the fight against climate change.