The Netherlands continues to punch above its weight when it comes to sustainability. So what’s its sustainability secret? Thursday is a big day in the corporate sustainability calendar. The latest Dow Jones Sustainability Index (DJSI) series is out.The frontrunners remain unknown, yet if previous years are anything to go by, there’s a good chance that a hatful of Dutch companies will be among them. Netherlands-based global brands such as Philips, Unilever, AkzoNobel, DSM and PostNL have emerged as DJSI stalwarts. Home to less than 17 million people and with an economy less than a third the size of France’s, this small European state continues to punch far above its weight in the sustainability stakes. So why is this?