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The writer and activist Naomi Klein reached an international audience with her first book, the best-selling No Logo, a rallying cry against the power of corporate brands and the replacement of traditional manufacturing jobs with sweatshop labour.

Since then, she's turned her intellectual ire on to even bigger terrain - the political and economic systems underpinning capitalism and climate change. The way to save the planet, she says, requires a radical rethink which will address what she calls the "unresolved tensions" between big business and over-consumption.

It's no surprise then that her fierce broadsides against the free market ideology have attracted plaudits and opprobrium in equal measure. But, coming from a family steeped in political activism, such polarized reactions come with the territory. Her grandparents were fervent Marxists and she was born in Canada to American activist parents who fled the US in protest against the Vietnam War. Her mother is a feminist filmmaker while her doctor father was heavily involved with the natural birth movement.

Growing up in the 1980s, she was a committed shopper and self-confessed "teeny bopper." But at 19 she experienced a dramatic political awakening - after that, she says, "you had to call yourself a feminist."

Presenter Kirsty Young
Producer Paula McGinley.