My daughter-in-law, Anya, asked me during my recent visit to Sydney whether I believe in global warming. My answer was inconsequential. Years before the topic of carbon emissions became a public discourse, I was acutely conscious of how society was harming the environment.

As a young boy I was mystified by municipal laws that permitted sewerage pipes to empty their contents into a sparkling sea, close to where we were holidaying, or how renowned companies allowed their delivery trucks to cough out toxic diesel fumes into our Jacaranda-fragranced suburban air...

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