Yasmin Morgan-Griffiths explores how research linking climate change and extreme weather events is being used in lawsuits against major polluters. Paul Carter heads behind the scenes of FC Barcelona's renovated stadium as it reopens to the public. Martin Sharkey takes a journey into the history of the emoji. And Nick Kwek visits Austin, Texas, to meet some of the key voices and innovators at this year's SXSW Festival.

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