These are material in the environment that are used by humans either for life process or for cultural activities.

It describes the practice of managing resources so that current needs are met without harming future generations.

Resources that can replenish themselves over time

One of the greatest threats to biodiversity on Earth?

An energy resource that will run out in the next several hundred years.

These are wastes that are usually flushed away in water

These are released when fossil fuels are burned.

This is a mixture of smoke, fog and chemicals.

This means the transfer of doing work by human hands and feet to the use of machines.

The pollution which does not persistent harm to life support system.

This involves changes in attitudes and values that influence or change our lifestyles.

it refers to presenting information on nature and environmental issues that is particularly opinionated and encourages to adapt more environmentally sensitive attitudes.

He is the first chief of US Forest Service who represented the idea of conservation large tracts of land and putting other forests to wise and efficient use.

The founder of the Sierra Club

A professor of wildlife management who introduced the concept of land ethics, arguing that humans should transform themselves from conquerors of nature into citizens of it.

America's first national wilderness area

The organization that helped stop whaling, nuclear testing, as well as lead efforts to protect Antarctica.

One of the oldest conservation organization in existence that fights for the preservation of land and forest, clean air and water and the host of other issues in America.

The organization that works to preserve nature and its creatures.

the mission of this organization is to conserve and restore natural ecosystems, focusing on birds, other wildlife and their habitats for the benefit of humanity and the earth's biological diversity