Last updated: September 24, 2009 10:49 pm

Global warming

A Martian visiting this week’s United Nations conference on global warming might conclude that there is no other issue with so much international consensus and momentum. There must be hope for humanity yet. But the inconvenient truth is that the odds of a binding treaty when leaders reconvene in 10 weeks in Copenhagen are slim.

The bogeyman of Kyoto, George W. Bush, may have been replaced by a passionate, internationalist Barack Obama and a Democratic Congress, but the US delegation is unlikely to have a specific pledge when it arrives in Denmark.

Healthcare and financial system reform are centre-stage, while a climate bill passed by the House languishes. Even that plan, for a 17 per cent reduction in emissions from 2005 levels by 2020, falls short of European and Japanese pledges.

The Senate ratifies treaties and its main objection to Kyoto was the exemption granted to developing nations, which is why President Hu Jintao’s bold language at this week’s summit inspired hope.

China has since claimed the top spot in carbon emissions and its participation, with perhaps a slight nod to its lower per capita output, is critical. The same is true for smaller developing nations which, as a group, have requested an unrealistic $400bn compensation from rich countries for binding limits.

With any other issue, the answer might be to aim for more modest goals or a limited agreement between the largest players. But the prospect of economic free riders poaching jobs and factories from signatories, and the fact that even a 70 per cent cut in emissions would merely stabilise atmospheric CO2 by the end of the century, make a grand deal necessary. Barring big, specific pledges by the US and China, their leaders’ oratory this week has been just more hot air.

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