Pope Francis this morning had a meeting with a fellow green activist: Leonardo DiCaprio.

The Oscar-nominated actor had a morning audience with the pope, with the Vatican confirming the meeting was on Francis's agenda.

The pope's environmental encyclical Laudato Si (Praise Be) has been embraced by environmentalists for its denunciation of the world's fossil fuel-based economy and demand for greener energy sources.

Di Caprio, nominated for an Oscar for his role in The Revenant, is a long-time environmental campaigner who in 1998 launched his eponymous foundation to support initiatives aimed at sustainability.

He recently addressed the World Economic Forum in Davos, Switzerland, announcing that the foundation is donating another 15 million US dollars to environmental projects and pleading with business leaders to battle global warming.

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