Monbiot Discovers Math, Puts it to Good Use

George Monbiot has discovered something important. The simple math of proposed emissions reductions policies does not work. He writes in the Guardian on Tuesday:

Last week the G8 summit adopted the UK's two key targets : it proposed that developed countries should reduce their greenhouse gases by 80% by 2050 to prevent more than two degrees of global warming. This meant that it also adopted the UK's key contradiction, as there is no connection between these two aims. An 80% cut is very unlikely to prevent two degrees of warming; in fact it's not even the right measure, as I'll explain later on. But let's work out what happens if the other rich nations adopt both the UK's targets and its draft approach to carbon offsets.

Please bear with me on this: the point is an important one. There are some figures involved, but I'll use only the most basic arithmetic, which anyone with a calculator can reproduce.

The G8 didn't explain what it meant by "developed countries", but I'll assume it was referring to the nations listed in Annex 1 of the Kyoto protocol: those that have promised to limit their greenhouse gases by 2012. (If it meant the OECD nations, the results are very similar.) To keep this simple and consistent, I'll consider just the carbon emissions from burning fossil fuels, as listed by US Energy Information Administration. It doesn't publish figures for Monaco and Lichtenstein, but we can forgive that. The 38 remaining Annex 1 countries produce 15bn tonnes of CO2, or 51% of global emissions. Were they to do as the UK proposes, cutting this total by 80% and offsetting half of it, they would have to buy reductions equal to 20% of the world's total carbon production. This means that other countries would need to cut 42% of their emissions just to absorb our carbon offsets.

But the G8 has also adopted another of the UK's targets: a global cut of 50% by 2050. Fifty per cent of world production is 14.6bn tonnes. If the Annex 1 countries reduce their emissions by 80% (including offsets), they will trim global output by 12bn tonnes. The other countries must therefore find further cuts of 2.6bn tonnes. Added to the offsets they've sold, this means that their total obligation is 8.6bn tonnes, or 60% of their current emissions.

So here's the outcome. The rich nations, if they follow the UK's presumed lead, will cut their carbon pollution by 40%. The poorer nations will cut their carbon pollution by 60%.

Are poor countries actually going to cut their emissions? No. You can do the math from there.