I believe that the financial crisis of 2008/9 exposed more a lack of ethics and morality - especially by the financial sector - rather than a problem of regulation or criminality. There were, of course, regulatory lessons to be learned, but at heart, there was a collective loss of our moral compass.
More and more businesses are seeing the potential of a more sustainable business model, driven both by the firm belief that business can be a force for good and by the realization that the cost of inaction often exceeds the cost of action - notably when it comes to the growing threat of climate change and water scarcity.
At the end of the day, people will follow you or people will be energised by you if they buy into your vision or purpose. So the most important thing is to be true to yourself. That's why I would say to be a great leader - you, first and foremost, have to be a great human being. And sharing that purpose and sharing the values.
The great challenge of the 21st century is to provide good standards of living for 7 billion people without depleting the earth's resources or running up massive levels of public debt. To achieve this, government and business alike will need to find new models of growth that are in both environmental and economic balance.
Every few decades, we have an opportunity to make a drastic change to the way we live our lives. We get a chance to design the building blocks of our daily routines, the infrastructure that will support and accompany us for the years to come - from the trains and trams we ride, the offices we work in, to the energy that powers our homes.