The most progressive US president in a generation comes to the most important international meeting since the Second World War and delivers a speech so devoid of substance that he might as well have made it on speaker-phone from a beach in Hawaii. His aides argue in private that he had no choice, such is the opposition on Capitol Hill to any action that could challenge the dominance of fossil fuels in American life. And so the nation that put a man on the Moon can't summon the collective will to protect men and women back here on Earth from the consequences of an economic model and lifestyle choice that has taken on the mantle of a religion.

Then a Chinese premier who is in the process of converting his Communist nation to that new faith (high-carbon consumer capitalism) takes such umbrage at Barack Obama's speech that he refuses to meet - sulking in his hotel room, as if this were a teenager's house party instead of a final effort to stave off the breakdown of our biosphere.

Late in the evening, the two men meet and cobble together a collection of paragraphs that they call a "deal", although in reality it has all the meaning and authority of a bus ticket, not that it stops them signing it with great solemnity.