by Holly ROBERTSON Agence France Presse SYDNEY, Australia (AFP) — Australia’s biggest city is facing a “public health emergency” over the bushfire smoke that has choked Sydney for weeks, leading doctors warned Monday after hospitals reported a dramatic spike in casualty department visits. Hundreds of climate change-fuelled bushfires have been raging across Australia for months, with efforts to contain a “mega-blaze” burning north of Sydney destroying an estimated 20 homes overnight and fires near […]