Australia has experienced the biggest sustained rainfall for 30 years in Sydney and the surrounding areas, causing flooding after a summer of extreme heat and deadly bushfires.
During strong winds, bushfires are racing through New South Wales and Queensland, even cancelling flights as Sydney airport is hit by the flames.
Coordinators expect more than a million young people to join protests in at least 110 countries.
Following the terrorist attack, New Zealand women are wearing headscarves in a show of solidarity with the Muslim community.
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