Australia’s Senate rejected the government’s climate-change legislation, forcing Prime Minister Kevin Rudd to amend the bill or call an early election.

Senators voted 42 to 30 against the law, which included plans for a carbon trading system similar to one used in Europe. Australia, the world’s biggest coal exporter, was proposing to reduce greenhouse gases by between 5 percent and 15 percent of 2000 levels in the next decade.

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