As part of its landmark climate package, the bloc agreed last December to the 20 per cent offer and to automatically boost that goal to 30 per cent if other nations made "comparable efforts".

作为其里程碑式气候变化应对方案的一部分，欧盟各国在去年12月同意，提出减排20%的提议，并在其它国家做出“可比的努力”的情况下，自动提高减排目标至30%。

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Mr Bersani, leader of the Democratic Party, has declined a coalition offer from former PM Silvio Berlusconi, whose centre-right bloc is the second strongest in parliament.

BBC: Italy President Napolitano begins coalition talks