Media captionClimate change: Fears about effects of pollution and climate change
Thousands of schoolchildren worldwide have abandoned classrooms for a day of protest against climate change.
India, South Korea, Australia and France are among the countries where teenagers are already on strike.
The day of action is expected to embrace about 100 countries. They are inspired by Swedish teenager Greta Thunberg, who protests weekly outside Sweden's parliament.
Scientists say tougher measures are needed to cut global warming.
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