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WONG: Twenty of the world's top emitters of greenhouse gases are in Japan attending G20 climate talks. Discussions are aimed at curbing carbon emissions and funding cleaner energy projects. Here's more from Tokyo. STORY: The three-day meeting comes after nations agreed to produce a new global climate pact by the end of 2009. Japan's environment minister, Ichiro Kamoshita, says Japan is looking at a variety of options to meet tighter green targets. But the world's number five greenhouse gas emitter faces the struggle of getting other countries to agree to changes. [Ichiro Kamoshita, Japanese Environmental Minister]: "A 'cap and trade' system and environmental tax are being considered with respect to quality of life, but whether we actually need legislation to meet the targets is uncertain." Japan backs a 50 percent cut in emissions by 2050. But last year's G8 host, Germany, failed to convince other members to make firm commitments. Japanese businesses are reluctant to accept mandatory numbers. But Kamoshita expects a fair system to be developed and compared it to a crash diet. [Ichiro Kamoshita, Japanese Environmental Minister]: "This may be like a 100-kg person who has never dieted looking to drop 10 kg, or a boxer trying to make a certain lower weight, and while all may not think cutting emissions by a certain percentage is fair, at least for Japan we're thinking this way." A fund to help developing nations fight climate change will also be on the agenda.