Water security, climate change and COP26Water security and climate change are only two of the major problems humankind is facing at present, and they will continue to be so for decades to come. However, important as they are, there are many other critical problems the world will have to confront for the rest of the 21st century. Most of these problems are now known, but there may be some black swan incidents, such as Covid-19, which are unexpected and may occur in the coming decades. If so, these could make the global situations even more complex than anticipated at present. Read our comments.