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3 May 2023, The Conversation: Two trillion tonnes of greenhouse gases, 25 billion nukes of heat: are we pushing Earth out of the Goldilocks zone? Since the 18th century, humans have been taking fossil fuels out of their safe storage deep underground and burning them to generate electricity or power machinery. We’ve now converted coal, oil and gas into more than two trillion tonnes of heat-trapping carbon dioxide and other greenhouse gases and added them to the atmosphere. The current result? The average temperature at the planet’s surface is about 1.2℃ hotter than in the pre-industrial era. That’s because adding new carbon to the world’s natural carbon cycle has caused an imbalance in the amount of energy entering and leaving the Earth system. To warm the entire planet takes an extraordinary amount of extra energy. Recent research shows we’ve added the energy of 25 billion nuclear bombs to the Earth system in just the last 50 years. Billions of nuclear bombs to produce 1.2℃ of heating – so what? It seems small, considering how much temperature varies on a daily basis. (The world’s average surface temperature in the 20th century was 13.9℃.) But almost all of this energy to date has been taken up by the oceans. It’s no wonder we’re seeing rapid warming in our oceans. Read more here