Swedish Prime Minister Fredrik Reinfeldt on Tuesday called on all countries to contribute to the success of the climate change conference in Copenhagen next month.

"We can only reach an ambitious agreement in Copenhagen if all parties contribute to the process," Reinfeldt said in an op-ed piece in the daily Dagens Nyheter.

All developed countries must show their leadership to take on ambitious emissions reductions, present proposals on financing and intensify their work, said Reinfeldt, whose country currently holds the rotating EU presidency.

The developing countries must also present clear commitments that reflect their responsibility and ability, he said.

Reinfeldt pointed out that the UN negotiations are still moving slowly and are reducing chances of success with just over a month to go before the climate change conference.

"It would be a major political failure if no agreement were reached in December. Climate change will not wait for drawn-out negotiations. That is why everyone has a responsibility to make Copenhagen a success," he said.