Green chemistry

I have not ever heard about green chemistry in English, but might have in my native language.  Although it is unfamiliar term, I like the meaning of the green chemistry.  It is very meaningful in term itself and provides us hope for green and healthier environment.  The list of 12 principles are all required to be green chemistry.  First principle is "prevent waste", which I think is most effective and easiest method for us to perform.  Prevention is easier than fixing after problems rising. In the previous video about 6 classes chemicals, all of the presenters asked us at the end of video if we really need the products that contains toxic chemicals or metals.  In many times, we can use alternative products, which will reduce the waste at the first stage.  Second is "maximize atom economy".  This seems more researchers or scientists' job to focus. To be honest, I am not 100% sure how maximized atom economy would benefit for green chemistry.  However, it is efficient methods economically (Can someone explain about it briefly?)  The third principle totally makes sense.  It can go with first principle as I mentioned about alternative products.  By using less hazardous chemical syntheses, we can prevent toxic waste.  The fourth principle is even better than the third principle because it is "safer" to use.  The fifth principle is focused on solvent and reaction condition specifically.  As we just have learned from 6 classes chemicals, organic solvents cases various health problems especially in the young.  Therefore, it is significant to invent safer chemicals for them.  The sixth principle is what I have thought about my house.  My house is old, so the ventilation is not good.  It costed so much money from running the heat last few months.  I decided to build house with good ventilation when I have a chance in the future.  One of our classes also covered about the seventh principle.  In particular, agricultural products produces lots of toxic chemicals.  The positive thing is that more people have been aware that problems, which leads to healthier environment. For the eighth principle, we should avoid anything that produces additional reagents and waste.  Can anyone think of the example for this from our classes? The ninth principle is interesting. Catalysts are smart and effective chemicals.  I am curious how and where it can be used more specifically.  Regarding to the next principle, I hope we can apply this principle for all the chemicals.  Accumulation is serious problems in lots of chemicals.  For example, lead cannot be eliminated, but accumulated in our body.  It would be highly beneficial to invent chemicals to degrade.  The 11th and 12th principles are very important as public health providers.  It is difficult to improve our environment without analyzing.  Also, we need the chemicals that does not produce toxic from accidents, which happen everywhere.