However, heavy industrial effluents and wastewater discharges in the later 20th century caused the rivers to become heavily polluted. A substantial clean-up program for both rivers is underway, financed through a partnership between local government and international development banks such as the Japan Bank for International Cooperation. The original flora consisted mainly of broadleaf evergreens. Non-native species are common, as the mild climate and abundant rainfall permit a multitude of tropical, subtropical and temperate plants to be cultivated, especially the ubiquitous eucalyptus. The record high temperature was
São Paulo Metro
The metro system consists of six color-coded lines: The metro system carries about 4,, passengers a day. Metro and CPTM are integrated through various stations. Metro and CPTM both operate as State-owned companies, and have received awards in the recent past as one of the cleanest systems in the world by ISO Commercial operations started on September 14, , after an eight-year "gestation" period that began in , under Mayor Faria Lima 's administration.
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