Waste/Garbage

Waste (also referred to as rubbish, trash, refuse, garbage, or junk) is unwanted or unusable materials.
In living organisms, waste is the unwanted substances or toxins that are expelled from them. More commonly, waste refers to the materials that are disposed of in a system of waste management.
Waste is directly linked to human development, both technologically and socially. The composition of different wastes have varied over time and location, with industrial development and innovation being directly linked to waste materials. Examples of this include plastics and nuclear technology. Some components of waste have economical value and can be recycled once correctly recovered.
Waste is sometimes a subjective concept, because items that some people discard may have value to others. It is widely recognized that waste materials are a valuable resource, whilst there is debate as to how this value is best realized.

http://en.wikipedia.org/wiki/Waste

The Role of Human

As we all know these days about the environmental issues are sticking out even a discussion at every meeting between the countries. As part of the human beings should be able to cope with this and can preserve the environment. This can we start from ourselves, that is by keeping the environment clean. If every person in the world aware of this, the environmental issue will be muted.
By taking out the trash in place, separating the existing types of waste, reducing the use of goods that can generate garbage and can not recycle, reuse some items that have been used (of course with appropriate processing), the above activity is a real manifestation of people that we support in preserving the environment.