A virtual TED event also focused on ways in which damage to the environment can fuel social and racial injustice.
WWF says increasing deforestation and agricultural expansion key drivers behind 68 percent average decline in animal, bird, and fish populations between 1970 and 2016.
Meltwater is threatening ice shelves surrounding 76 percent of Antarctica's coastlines that could create a dramatic rise in sea level, scientists say.
Polar bears in 12 of 13 sub-populations analysed will have been decimated within 80 years by the galloping pace of change in the Arctic, which is warming twice as fast as the planet as a whole, scientists say.
A handful of people stood in the background holding banners reading "Wake Up: Climate Action Now" and "Crisis is Crisis" before being dispersed by police without incident.
African climate activists are making an appeal a week after American news agency The Associated Press faced backlash for cropping activist Vanessa Nakate out of a photo at the World Economic Forum in Davos, Switzerland.
Scientists say Earth is probably the hottest it has been during the Holocene — the past 11,500 years or so — making it the warmest period since the dawn of civilisation.
Bushfires ravaging Australia have provided a foretaste of the kinds of conditions that could become normal, says Richard Betts, Head of Climate Impacts Research at Britain's Met Office Hadley Centre.
Tens of thousands rally across the country to demand PM Scott Morrison's conservative government cut back on fossil fuels, as deadly climate-fuelled bushfires burn out of control.
British charity Christian Aid says the disasters displaced millions and caused widespread deaths - seven of them caused damage of more than $10 billion.
A marathon UN climate summit wrapped up with little to show, squeezing compromises from countries over the global warming battle plan but falling well short of what science says is needed to tackle the emergency.
Evidence that our planet is teetering on the edge of disaster is everywhere to be seen.
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