Why is Hollywood actor Mark Ruffalo feuding with Ireland's Green Party?

In a twist worthy of a Hollywood script, actor Mark Ruffalo has accused the Green Party in Ireland of "doing something really terrible to the environment", in a verbal war of words over a controversial planning bill. Taking to social media, the Avengers star blasted the party for failing to live up to its election promises on Ireland’s environmental future. Why is Ruffalo getting involved in Irish politics? And why do celebrities feel compelled to raise their voices on issues such as these? Host: Tabitha Monahan. Guests: Philip Ryan and Tessa Ndjonkou

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