Bushfires in Australia have killed 33 people and about 1 billion animals since September, while 2,500 homes and an area the size of Greece have been destroyed.
The centre-left leader announced Kiwis would go to the polls on September 19, two months ahead of the last possible date for the ballot, when she will seek a second three-year term.
Ivanisevic, a serve-and-volley specialist from Croatia, won the 2001 title at the All England Club as a wild-card entry while Martinez, a baseliner from Spain, was the 1994 champion at Wimbledon.
The 33-year-old was in virtuoso form to charge past the 27th seed 6-1, 6-2, 6-4 in hot sunshine on Rod Laver Arena and make the round of 16 at Melbourne Park for a 13th time.
Serena Williams was the bookies' favourite to win a record-equalling 24th Major at Melbourne Park but she came unstuck against a determined Wang, who won 6-4, 6/7 (2/7), 7-5 – after taking only one game the last time they met.
While human-caused greenhouse gas emissions are responsible for the bulk of the increase in CO2 levels, Australia's bushfires have made the problem measurably worse, underscoring the impact of the catastrophe on the global climate system.
The unseeded 29-year-old brings the curtain down on a career that saw her win 30 WTA titles, with her sole Grand Slam triumph coming in 2018 at Melbourne Park.
The victims were US residents, Australian authorities said, adding that they did not immediately know why the C-130 Hercules air tanker crashed while carrying a load of fire retardant.
High temperatures and strong winds fuelled an outbreak of new blazes across several areas in eastern Australia on Thursday, ending a period of respite following several days of rains and cooler weather.
As authorities warned that a days-long respite from high fire danger was coming to an end, economists said the cost to Australia’s $1.33 trillion economy could be as high as $3.4 billion.
Budget repair after years of deficits was a key promise ahead of last year’s election but Treasurer Josh Frydenberg sidestepped a question about whether the promised $3.4 billion surplus for the year to June 2020 could be delivered.
The 38-year-old swatted aside Steve Johnson 6-3, 6-2, 6-2 to race into the second round, kickstarting his bid for a 21st Grand Slam title in immaculate style.
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