Greta Thunberg’s impassioned speech at the UN about climate change elicited strong emotional responses. Five hundred words from a 16-year-old Swedish schoolgirl, about whom most people know little, have divided global opinion.

The core of the problem is not whether we are experiencing climate change. It’s a fact that, in the past 300 years, we have measurably experienced changes in the earth’s temperature. What is unclear is the underlying cause and solution. Yes, we have in the past few decades experienced a huge spike in carbon emissions but, what is dividing opinions, is whether this is indeed the main cause of the most recent global warming and whether reducing carbon emissions will be effective...

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