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What will be left of human civilisation in the geological record 100 million years hence?Justin Rowlatt speaks to the geologist Jan Zalasiewicz of Leicester University in an extended interview, speculating on the durability of the human legacy. We may take pride in our cathedrals, technologies and feats of engineering. But what strange fragments will survive long enough for aliens visiting our planet in the distant future to discover? And will it be enough for those future geologists to figure out what caused the mass extinction we will leave behind in the fossil record?This is an extended version of an interview recorded for Justin's Geochemical History of Life on Earth, also available on the BBC World Service.Producer: Laurence Knight(Photo: Skull fossil artwork from the Modern Fossils collection by Christopher Locke. Credit: Christopher Locke/Heartless Machine)

The new variant poses a particular threat to China's hitherto successful zero-Covid strategy at a time when the country's economy is looking vulnerable.Ed Butler gets the latest on the fast-moving Omicron variant from Boston University epidemiologist Eleanor Murray. One new development is a recent study in Hong Kong that found that one of the two main Chinese vaccines offers very little resistance against it. Health security expert Nicholas Thomas of Hong Kong's City University says the Chinese government is now in a race to deliver booster vaccines to its population, while stopping Omicron from leaching across its porous land borders. It comes at a sensitive time, with the Beijing Winter Olympics to begin in February, and the government seeking to gently deflate a property market bubble ahead of a politically sensitive Communist Party Congress in October. But independent economist Andy Xie says that when push comes to shove, the government would rather lockdown the entire national economy rather than let Covid get out of control.Producer: Laurence Knight(Picture: A large crowd of commuters wearing face masks at a subway station in Hong Kong; Credit: Budrul Chukrut/SOPA Images/LightRocket via Getty Images)

2021 has seen some extraordinary economic changes. First a global economic rebound, then a global supply chain crisis, then inflation of a kind not seen in western countries for decades. And finally millions of people deciding they didn't even want to go back to work after lockdown. So what could 2022 have in store? Ed Butler discusses all this with Oxford economist Linda Yueh of Oxford University and author of the Great Economists, and Mohamed El-Erian, President of Queens College Cambridge. (Picture of interest rate graph. Picture credit: Getty Images).