The Earth's oceans are absorbing an astonishing amount of heat, and it's time to put that into perspective. Imagine every person on the planet making a cup of tea every second and pouring it into the sea. That's what's happening, according to a recent study. In 2021, the oceans absorbed a staggering 15 zettajoules of energy, which is equivalent to 4.8 billion mugs of hot tea entering the ocean every second. To put that into even more relatable terms, it's like seven Hiroshima-scale atom bombs exploding every second. But what does this mean for our planet? And what can we do about it?
The oceans are absorbing even more heat now than they were in 2021. In 2025, the oceans absorbed about 23 zettajoules of extra energy, which is equivalent to 7.6 billion cups of hot tea every second. That's almost one cup every second for every person on the planet. This extra heat is the physical effect of the trillion or more tonnes of carbon dioxide and other greenhouse gases we've added to the air since we began burning fossil fuels. It's raising sea levels, driving marine heat waves, and melting polar ice.
The tea cup analogy is a powerful way to understand the scale of the problem. It's a stark reminder that the Earth is absorbing ever more heat, and that we need to take action. As national promises of pathways to net zero become increasingly diluted, delayed, mocked, or forgotten, and as investments in fossil fuels rise steeply, we risk permanently impoverishing and endangering everyone else, for countless generations to come. It's time to invest in energy sources that are not carbon-based. It's time to make a change, and it's time to do it over a cup of tea.
