Today the world is faced with several environmental challenges. On the left they is a snapshot description of some of these challenges: Air pollution: global climate change, stratospheric ozone depletion, urban air pollution, acid deposition, outdoor pollutants, indoor pollutants and noise pollution. Biodiversity depletion: habitat destruction and degradation, and extinction. Water pollution: sediments, nutrient overload, toxic chemicals, infectious agents, oxygen depletion, pesticides, oil spills, and excess heat. Waste production: solid waste, and hazardous waste. As humans, we depend on nature for everything we use including food, air and water. We should therefore strive to prevent environmental impacts and also provide solutions. This is fundamental if we will be able to preserve the environment for our current needs and those in the future. This is where the concept of sustainable development comes in.