Plastics have brought huge benefits to our society. But with those benefits come environmental problems. Too often, plastic ends up as waste, as marine litter polluting the oceans, or as litter on our beaches.
Most people flush their wastewater down the drain without giving much thought to sewage treatment. But this service is a prerequisite for clean water, one of the most valuable resources in our society. The cost of inaction is too great, writes Emma Undeman.