Meridian is an independent data observatory: interactive dashboards, open datasets and analytical reports on climate, energy, cities and the ocean.https://alreadyowned.topen-UShttps://alreadyowned.top/en/reports/clean-air-policyhttps://alreadyowned.top/en/reports/clean-air-policyCities rarely "destroy" pollution — they move it in time and space. What an improving statistic really means, and where the exported emission hides.Sun, 02 Feb 2025 00:00:00 GMTairairpolicyAQIMeridian Researchhttps://alreadyowned.top/en/reports/misleading-axeshttps://alreadyowned.top/en/reports/misleading-axesA truncated axis, a dual scale and a cherry-picked interval — three tricks that turn honest data into a dishonest conclusion. Demonstrated on the very same numbers.Tue, 28 Jan 2025 00:00:00 GMTmethodsmethodologyvisualizationaxesMeridian Researchhttps://alreadyowned.top/en/reports/demographic-transitionhttps://alreadyowned.top/en/reports/demographic-transitionThe age pyramid is the most honest portrait of a society. We unpack why it changes shape, what the demographic transition is, and why population growth does not switch off at once.Fri, 24 Jan 2025 00:00:00 GMTpopulationdemographyurbanisationfertilityMeridian Researchhttps://alreadyowned.top/en/reports/air-qualityhttps://alreadyowned.top/en/reports/air-qualityA single AQI number is handy for a traffic light on your phone, but it conceals what air you actually breathe. We unpack PM2.5, the split of days by category and the daily NO₂ rhythm.Mon, 20 Jan 2025 00:00:00 GMTairairPM2.5AQIMeridian Researchhttps://alreadyowned.top/en/reports/sea-levelhttps://alreadyowned.top/en/reports/sea-levelThree millimetres a year sounds trivial until you see what stands behind it: the thermal expansion of water and the ocean's accumulated heat content, which has no stop button.Mon, 06 Jan 2025 00:00:00 GMToceanoceansea levelheat contentMeridian Researchhttps://alreadyowned.top/en/reports/urban-mobilityhttps://alreadyowned.top/en/reports/urban-mobilityThe modal split of trips shifts slowly and predictably. We look at how the structure of movement changed over fourteen years, and why a congestion heatmap beats an average speed.Sat, 14 Dec 2024 00:00:00 GMTurbancitymobilitytransitMeridian Researchhttps://alreadyowned.top/en/reports/energy-transitionhttps://alreadyowned.top/en/reports/energy-transitionSolar and wind have become cheap, but installed-capacity statistics mislead. Here is why the transition is decided at the evening peak, and what the daily load curve reveals.Mon, 02 Dec 2024 00:00:00 GMTenergyenergyrenewablesgridMeridian Researchhttps://alreadyowned.top/en/reports/climate-anomalieshttps://alreadyowned.top/en/reports/climate-anomaliesThe planet's average temperature is almost useless on its own. Here is why science measures departures from a baseline, what the CO₂ curve actually shows, and how to read warming stripes.Mon, 18 Nov 2024 00:00:00 GMTclimatetemperatureCO2methodologyMeridian Research