The schoolchildren on strike from school today in more than 100 countries are staging a global protest essentially about the failure of my generation to deal with climate change. They should of course be daunted by that collective failure. But they can also be uplifted by the opportunities they and the millennial generation have to do far better than us. My generation has failed for many reasons, but one holds the key to what younger generations must now do. We have tended to fiddle at the edge of solutions, not embracing the system changes required. In doing so, many of us have either exercised denial about the full extent of the problems, or only pretended to address them.