I’ve been working on these things for a long time, and I still find the accurate slogan to be:

much to learn, many questions to address

Sustainability is the work of multiple generations. There is no wormhole that will transport us all to a sustainable world. But trial and error are moving things forward. Naturally for this stage, errors are frequent. With patience and realism about what works and what doesn’t, understanding will increase and spread, concepts and tools will slowly mature, and practices of sustainability will guide the world more and more surely.