Guardian. Our home planet is struggling with a record energy imbalance, which is warming oceans to unprecedented levels, making weather more extreme and threatening health and food supplies, the World Meteorological Organization has warned.
The United Nations body confirmed 2015 to 2025 were the hottest 11 years ever measured, but a still bleaker message was that the rising temperature experienced by humans on the surface was only 1% of the faster-accumulating heat in the wider Earth system.
More than 90% of that excess is absorbed by the oceans, which experienced the highest heat content in history last year.
The authors of the latest annual State of the Global Climate report say this highlights the increasing vulnerability of a planet that is moving ever further out of balance as a result of human activity. The burning of oil, gas, coal and forests releases heat-trapping greenhouse gases such as carbon dioxide, methane and nitrous oxide, which are all at their highest level in at least 800,000 years.
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This disrupts the planet’s energy equilibrium.
At present, humans and other life forms on the surface directly suffer only a small fraction of that energy backup because 91% is absorbed by oceans, 5% by the land, 1% warms the atmosphere, and 3% melts ice at the poles and on high mountains.
But even with only a tiny share of this extra energy, the world’s surface temperatures – which are the most commonly used measure of global heating – are climbing to alarming levels. Last year was the second- or third-hottest on record, depending on the dataset. World leaders say it is now inevitable the planet will – at least temporarily – breach the target of limiting heating to 1.5C above preindustrial levels set by the Paris agreement. They say the dire consequences are already evident in faltering harvests, worsening dengue outbreaks and increasingly severe heatwaves, forest fires and storms.
“The state of the global climate is in a state of emergency. Planet Earth is being pushed beyond its limits. Every key climate indicator is flashing red,” said the UN secretary-general, António Guterres. “Humanity has just endured the 11 hottest years on record. When history repeats itself 11 times, it is no longer a coincidence. It is a call to act.”
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