Green technology, definition Greenness

These technologies might fall within the definition of Green Chemical Technologies . They may use alternative feedstocks to synthesize existing desirable molecules, make more efficient use of fossil-fuel (oil) derived materials, and/or, finally, create substances which give the same effect (utility) than those used currently but with less environmental or public health impact. 

Supercritical carbon dioxide extraction of natural products from solid plant matrices is currently an established application, with over one hundred industrial facilities of various sizes operating throughout the world. Several books have been published describing this process in detail - see, for example Brunner [1]. The main green credential of these processes is the replacement of volatile organic solvents. Their implementation resulted, however, from definite technological advantages. 

If we now consider prototypical chemistry-related issues from the debate about sustainable development and green chemistry many of them meet these criteria. Chemistry-related issues of sustainable development, like a more intense production and use of alternative fuels or bioplastics, are discussed in mass media. Regulations on their use will potentially have an impact on the students consumer choices. The use of alternative fuels or bioplastics is still controversial pro and con arguments are given in societal debate and can be used in students open debate. And, finally, these issues are definitely questions of chemistry and technology corresponding arguments are used in public debate. 

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