A move by the European Union to impose duties on carbon-intensive imports would scupper the chances of striking a global agreement to tackle climate change next year, the bloc's top climate official said on Thursday. European leaders have agreed to decide by October whether to set a 2030 goal to cut carbon emissions as the EU contribution to a global pact to tackle climate change, due to be signed in Paris in late 2015 and take effect from 2020. Last month France suggested measures could be taken against imported goods to ease concerns that the 2030 goals could threaten heavy industries competing with foreign rivals that might be subject to laxer environmental goals.