BHP boss Andrew Mackenzie warns climate change is an "existential" risk

The head of the world's biggest miner company has conceded that climate change is an "existential risk" to the planet. 

BHP chief executive Andrew Mackenzie warns that the world's dependence on fossil fuels is undeniable and presents the biggest threat since World War 2. 

In a message to the global resources industry and climate deniers, Mr Mackenzie said BHP would reduce its own emissions over the next five years and tackle pollution caused when customers use its products.

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