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Can we clean up air travel? Adrienne Murray takes to the skies in Sweden to explore developments in electric flight. Joe Tidy visits rural Zambia to see how Bitcoin is helping electricity projects to get thousands of villagers on the grid. Nick Kwek has the tech developments from the SXSW Festival in Austin, Texas. And Alasdair Keane gets up close to the rhinos at a new conservation centre in the UK.