A tonne of methane traps far more heat than a tonne of CO₂: over 20 years, its warming power is about 80 times greater, according to the IPCC. But it lingers in the atmosphere for only about a decade, versus centuries for part of the CO₂. Cutting methane emissions, from livestock, waste and fossil fuels, is therefore one of the fastest ways to slow warming.
On 27 August 1883, the eruption of the Indonesian volcano Krakatoa was heard as far away as Rodrigues Island, nearly 4,800 km away. Its pressure wave was picked up by barometers worldwide and circled the globe several times. The tsunamis that followed killed more than 36,000 people.
The deepest known point in the ocean, Challenger Deep, lies roughly 10,900 m below the Pacific surface. Drop Everest in and its summit would still sit about 2 km underwater. Down there, the pressure is more than 1,000 times what you feel at sea level, roughly a tonne pressing on every square centimetre.