Pollution of the Guanabara has been a long-term issue; although officials promised at the Earth Summit in 1992 that they would begin to address the pollution, previous attempts to do so have been insufficient.
瓜纳巴拉湾是长期的问题，尽管官员在1992年地球高峰会上承诺将着手解决污染，但此前的尝试都不奏效。