In his first article (meu primeiro artigo) (1984), Marcos Reigota tells about his initiatic experience as Science teacher with children attending two primary schools located in two different areas of the metropolis of São Paulo, Brazil. The first area is affected by a growing industrialization and the problem of pollution becomes matter of discussion among the pupils; the second area is marked by the tertiary sector and is occupied by a favela (shanty town), where most of the children attending the second school live. In the lessons, the concept “think global-act local” is used to stimulate children to be aware of and concerned about global environmental problems as well as about the problems which affect their daily life.

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