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Image caption Darkness descends on Sao Paulo at 16:00 (20:00 GMT) due to smoke from forest fires. A daytime blackout in a Brazilian city has prompted thousands of people to voice their concerns for the welfare of the Amazon rainforest. Sao Paulo was blackened for around an hour on Monday after strong winds brought in smoke from forest fires burning in the states of Amazonas and Rondonia, more than 2,700km away. The hashtag #prayforamazonia has now emerged as a global Twitter trend with more than 150,000 references to the fires. Sao Paulo resident Gianvitor Dias told the BBC what it was like in the city during the smoke-filled blackout on Monday afternoon. "It was as if the day had turned i... Full story

21 August