
Climate change: Earthquake ‘hack’ reveals scale of ocean warming
Scientists have found a clever new way of measuring ocean warming, using sound waves from undersea earthquakes. The researchers say the "hack" works because sound travels faster in warmer water.The team looked at sonic data from the Indian Ocean emitted by tremors over a 10-year period.As the seas have warmed due to global heating, the scientists have seen the sound waves increase in speed.Their new method shows the decadal warming trend in the Indian Ocean was far higher than previous estimates.Having accurate information on the warming of our oceans is critical for climate scientists.They understand that around 90% of the energy trapped in our atmosphere by greenhouse gases is absorbed by the seas.But having precise temperature...