Rethink is not the only company to toy with the idea that forecasting of renewables investment should begin with understanding where each country needs to be if it were in line with its Paris 2015 agreed contributions, and assume that at some point it will have to get there. Most forecasters in the business seem to think that business as usual will continue for a long time, and then some token effort to catchup with where any country should be will be undertaken half-heartedly and we’ll all end up at 3°C. But a group of academics have just produced a paper suggesting that economic self-preservation must come to dictate global strategy or between $150 trillion and $791 trillion will be…