Although the Copenhagen climate talks next month may not yield a consensus on reducing greenhouse gas emissions, it is "only a matter of time" before the U.S. and China--the world's two largest polluters--commit to targets, International Energy Agency Executive Director Nobuo Tanaka said Tuesday. Committing to targets is essential for energy security and economic growth in both countries, Tanaka told Dow Jones Newswires
Although the Copenhagen climate talks next month may not yield a consensus on reducing greenhouse gas emissions, it is "only a matter of time" before the U.S. and China--the world's two largest polluters--commit to targets, International Energy Agency Executive Director Nobuo Tanaka said Tuesday.

Committing to targets is essential for energy security and economic growth in both countries, Tanaka told Dow Jones Newswires.

"They aren't sure what the costs are [for their economies], but if the benefits suddenly surpass the costs, and there is a mutual understanding between both parties, it will happen," he said.

Tanaka said he plans to be in Copenhagen for the second week of talks and that the IEA was cautiously optimistic about the results. "It's difficult, but without a clear message from Copenhagen, nothing will happen."

Meanwhile, increased refining capacity in China, India and the Middle East will likely be balanced by ample supplies of crude oil, he said.

However, refinery investments will "create more competition for less-competitive refiners in OECD [Organization for Economic Cooperation and Development] countries, so overcapacity could happen in these less competitive-refining sectors."

Tanaka said it was "very disappointing" that China recently stopped releasing data about its oil-product stockpile levels.

"We hope that they will start reporting it again, because getting the information is very important for making projections about consumption and demand."

Countries such as China may be hesitant to compile and release energy data because of the high cost, objections from the private sector and for national security reasons, he said.

But, "it's in everybody's interest to provide better data; more transparency is the best way to make the market function better," he said.

He said China and India will eventually become members of the IEA, without giving a specific time frame for the memberships.

"Without question, the majority of energy consumption is already in non-OECD members," he said. "It's obvious to have them be members, and our cooperation will pave the way for future membership of these countries."