Measuring "Greeness" of a Company

I was on a drive to a meeting when my colleague mentioned that Mercedes has just revealed its new car. The conversation develops to why Mercedes is able to sell a car at higher price. At the same level of technology (i.e. less emission per mile driven) or better Mercedes sell the car at higher price. This means to reach the same income level, Mercedes only needs to sell fewer cars than Toyota or Honda. If the car is driven for the same distance then emission per monetary unit paid to get the car is less for Mercedes. It seems the Mercedes is greener than the other two.

Ban Plastic Bag - Now or Later?

In some cities around the world there are already movements to ban the use of plastic bags especially those that are not biodegradable. San Francisco claimed that it is the first city to ban non-bio plastic bag and replace the them with bio degradable plastic bags or recyclable paper bags. The ban of plastic bags in general will give positive impact to the environment. plastic material is based on oil which is non renewable resource. the manufacturing of plastic will certainly deplete the oil reserve although might not be as fast as car burning it. Normal plastic will not bio degrade and they just photo degrade. It means plastic will not rot. Normal plastic will turn into small pieces tiny enough to contaminate water and soil. If taken into the body, the plastic particles will contaminate the body and do harm to our health. Burning normal plastic will also not solve the problem. Burning plastic will emit toxic gases that eventually pollute the air and harm people.