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Calls are rising for a waiver of patent protections on Covid-19 vaccines - but would it do anything to accelerate their rollout in the developing world?Manuela Saragosa speaks to an advocate of the "People's Vaccine" campaign, which aims to end the control of the major pharmaceutical companies. Els Torreele of University College London says much of the research and development of these vaccines was publicly funded anyway, and the need to negotiate patent agreements prevents other companies from rapidly scaling up vaccine production.The need to speed up the rollout is testified to by the South African professor of vaccinology Shabir Madhi, who points out that his own country has yet to begin immunising the general public. But Thomas Cueni of the global pharmaceutical industry body, the IFPMA, says they are already on course to vaccinate the world within a year.Producer: Laurence Knight(Picture: A man is vaccinated at a hospital in Nairobi, Kenya; Credit: Robert Bonet/NurPhoto via Getty Images)

The chief scientist for the World Health Organisation acknowledges the frailty of the official numbers. Ed Butler speaks to Anthony Masters, the statistics ambassador for the UK's Royal Statistical Society who explains that one way to try to count the number of deaths is through excess deaths figures. But in countries like India there aren't very reliable national mortality statistics to start with, and there's often a long delay in delivering the latest numbers. One man who's done as much as any to sift through the data available is Murad Banaji, an Indian-born mathematician based at the University of Middlesex in the UK. He says the Indian death toll could be between three and eight times higher than the official data. (Picture: A relative of a Covid-19 patient cries in New Delhi, India. Picture credit: Raj K Raj/Hindustan Times via Getty Images)

The recycling of lead acid batteries poses a growing health hazard in many developing countries.Vivienne Nunis looks at the case of Bangladesh, where a cottage industry has sprung up all over the country, with old car and auto-rickshaw batteries being burned in unsafe conditions, poisoning the surrounding land, animals, plants and people. Researcher Bret Ericson says that hundreds of millions of children across the developing world have dangerously high blood lead levels, risking damage to their developing brains. Andrew McCartor of the anti-pollution activists Pure Earth explains why the economics of battery recycling make it such an intractable problem, while Adam Muellerweiss of the major global battery manufacturer Clarios explains what he thinks needs to be done to make recycling a fully closed-loop process, as it is in the developed world. Plus industry journalist Christian Ruoff explains why the rise of electric vehicles does not spell the end of lead acid batteries.(Picture: Used batteries piled up at a recycling plant in Russia; Credit: Peter Kovalev\TASS via Getty Images)