Researchers say the world has seriously underestimated the amount of heat soaked up by our oceans over the past 25 years.
Their study suggests that the seas have absorbed 60% more than previously thought.
They say it means the Earth is more sensitive to fossil fuel emissions than estimated.
This could make it much more difficult to keep global warming within safe levels this century.
This new calculation shows that far more heat than we thought has been going into oceans. But it also means that far more heat than we thought has been generated by the warming gases we have emitted.
Source: Radio Pakistan