social movements

Social movements are a type of group action. They are large, sometimes informal, groupings of individuals or organizations which focus on specific political or social issues. In other words, they carry out, resist or undo a social change.
Modern Western social movements became possible through education (the wider dissemination of literature), and increased mobility of labor due to the industrialization and urbanization of 19th century societies. It is sometimes argued that the freedom of expression, education and relative economic independence prevalent in the modern Western culture are responsible for the unprecedented number and scope of various contemporary social movements.
Modern movements often utilize technology and the internet to mobilize people globally. Adapting to communication trends is a common theme among successful movements. Research is beginning to explore how advocacy organizations linked to social movements in the U.S. and Canada use social media to facilitate civic engagement and collective action.

Giddens sorted social movements into four groups. One of groups is environmental movements. I think  environmental movements are the most important thing in modern society. and I want to know another classification of social movements.