Spurred on by Swedish wunderkind Greta Thunberg -- virtually unknown outside of her homeland a year ago but now a global star nominated for a Nobel prize -- millions of young people took part in weekly demonstrations demanding climate action. Although scientists have warned for decades about the risk to humanity and Earth posed by unfettered burning of fossil fuels, in 2019 -- set to be the second hottest year in history -- their message seems to have finally hit home. The 2015 Paris agreement saw nations commit to limiting global warming to two degrees Celsius (2.7 Fahrenheit) above pre-industrial levels as a way of curbing the worst impacts of global warming.
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