SYDNEY/LONDONSYDNEY/LONDON (Reuters) - Thousands of Australians took to the streets on Friday to protest against government inaction on climate change, as bushfires ravaged tens of thousands of square miles of bushland after months of destruction and at least 27 deaths.

Anger spread to Britain, where scores of people gathered in the Strand in central London to denounce Australian Prime Minister Scott Morrison, branded by one placard as a "fossil fool".

The bushfire crisis has added pressure on Morrison's conservative government to do more to combat climate change after Australia weakened its commitment to the U.N. Paris climate accord last year.

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Friday's demonstrations came as authorities urged nearly a quarter of a million people to flee their homes and prepared military backup as soaring temperatures and erratic winds fanned bushfires across the east coast.

Major roads in Sydney were blocked as protesters chanted "ScoMo has got to go", referring to Morrison, while placard read 'Save us from hell'.

There were similar protests in Canberra, the capital, and Melbourne, where air quality turned so noxious this month that the two cities featured among places with the most polluted air on earth.

More than 100 people chanted slogans outside the Australian High Commission in London. Banners said "Stop Killing our Planet (PLEASE)" and "Inaction against climate change, that's just not cricket".

Extinction Rebellion protesters joined the demonstration, blocking the road, banging drums and holding up traffic. A food trailer attached to a bike handed out free hot vegan food.

Londoner Peter Cole, 76, held up a sign saying "Climate Change Denier Scott Morrison Fiddles while Australia Burns".

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"I'm here because the Australian government is doing absolutely nothing to combat climate change. In fact they're largely denying it and they need to be put under a lot of pressure..."

Morrison has repeatedly rejected criticism that his government is not doing enough. On Friday, he told Sydney radio 2GB that it was disappointing that people were conflating the bushfire crisis with Australia's emission reduction targets.

"We don't want job-destroying, economy-destroying, economy-wrecking targets and goals, which won't change the fact that there have been bushfires or anything like that in Australia," he said.

''Red Brigade'' activists gesture as they participate in a demonstration against the Australian government's inaction over climate change despite the bushfires crisis, outside the Australian Embassy in London, Britain, January 10, 2020. Reuters/Henry Nicholls Protesters hold placards during a climate change rally in Sydney, Australia, January 10, 2020. AAP Image/Steven Saphore/via Reuters Protesters hold placards during a climate change rally in Sydney, Australia, January 10, 2020. AAP Image/Paul Braven/via Reuters Protesters hold banners and flags with an Extinction Rebellion logo as they demonstrate against the Australian government's inaction over climate change despite the bushfires crisis, outside the Australian Embassy in London, Britain, January 10, 2020. Reuters/Henry Nicholls

The CEO of German engineering giant Siemens said it will decide by Monday on its involvement in the development of a controversial Australian coal mine. Joe Kaeser was speaking after meeting climate activist Luisa Neubauer.

Friday's protests in Australia stirred debate, with Victoria state Premier Daniel Andrews saying they were wrongly timed and would divert police resources.

"Common sense tells you that there are other times to make your point," he told a televised briefing.

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"I respect people's right to have a view, I tend to agree with a lot of the points that are being made - climate change is real - but there is a time and a place for everything and I just don't think a protest tonight was the appropriate thing."

Climate scientists have warned the frequency and intensity of the fires will surge as Australia becomes hotter and drier.

Australia has warmed by about 1 degree Celsius since records began in 1910, NASA climate scientist Kate Marvel said this week.

"This makes heat waves and fires more likely," she said on Twitter. "There is no explanation for this - none - that makes sense, besides emissions of heat-trapping gases."