We can have it all: that is the promise of our age. We can own every gadget we are capable of imagining – and quite a few that we are not. We can live like monarchs without compromising the Earth’s capacity to sustain us. The promise that makes all this possible is that as economies develop, they become more efficient in their use of resources. In other words, they decouple. There are two kinds of decoupling: relative and absolute. Relative decoupling means using less stuff with every unit of economic growth; absolute decoupling means a total reduction in the use of resources, even though the economy continues to grow. Almost all economists believe that decoupling – relative or absolute – is an inexorable feature of economic growth. Yes, the Paris climate change conference can save the planet Ed Miliband Read more On this notion rests the concept of sustainable development. It sits at the heart of the climate talks in Paris next month and of every other summit on environmental issues. But it appears to be unfounded. A paper published earlier this year in Proceedings of the National Academy of Sciences proposes that even the relative decoupling we claim to have achieved is an artefact of false accounting. It points out that governments and economists have measured our impacts in a way that seems irrational. Here’s how the false accounting works.