Pollution has for too long been the faithful companion to industrial development with huge impacts on all living creatures, landscapes, soil, air and water. In many parts of the world the situation is and has been improving, but far from all parts, and the effects of one of the worst pollutions, the release of greenhouse gasses, is just starting to become very apparent and omnipresent. A high diversity and many approaches to combatting pollution and waste is available, and innovation is intensive as can be seen in this category.