Source: Conserve Energy Future

Environmental activism refers to the coming together of various groups of individuals and organizations that work in collaboration in social, scientific, political, and conservational fields with the main purpose of addressing environmental concerns. These people and organizations are collectively part of the green movement, green living, or environmental sustainability and do have a common agenda on protecting and preserving the environment.

The most significant ideology these people share in terms of ideas is coming up with solutions to environmental problems. Therefore, environmental activism can be divided into three parts based on its definition that is segmentary, polycentric, and networked. Segmentary means that the organization has a diverse group that comes together with a common interest. Polycentric means that the groups have multiple and often temporary centers of influence.  Lastly, it is referred to as networked because it has a loose, integrated, and reticulate network that has multiple linkages formed through overlapping membership. Among the main focus of environmental activism in the 21^st century are nuclear power, acid rain, toxic waste, and road building.