Live charts of Earth's key climate indicators, built from official NOAA, NASA and NSIDC records. Each one shows the latest value and the long-term trend — updated from public data, free, no sign-up.
The charts are built from official, public records: atmospheric CO₂ and methane from NOAA's Global Monitoring Laboratory, global temperature from the HadCRUT record kept by the Met Office Hadley Centre, sea level from satellite altimetry compiled by NOAA's Laboratory for Satellite Altimetry, and Arctic sea ice from the NSIDC Sea Ice Index. The temperature and sea-ice series reach this site via Our World in Data. Each indicator page names its exact source underneath the chart and offers the underlying series as a JSON download, so you can check any number yourself. LK Forge measures nothing of its own; it only redraws the published records.
How current is the climate data?
The climate data is as current as the last build of this page: each chart carries a data through date directly beneath it. The figures are snapshots taken from the source datasets at build time, so they lag the very latest month or two of the official record. Climate indicators move slowly, so that lag makes almost no difference to the trend you are reading. The indicators also update at different cadences — CO₂ and methane monthly, temperature and sea ice yearly, and sea level every few days from satellite altimetry — so their end dates do not all line up.
Why do these climate indicators matter?
Together they are the vital signs of the climate system: how much heat-trapping gas is in the air (CO₂ and methane), how much the surface has warmed (temperature), and two of the clearest consequences (rising seas and shrinking Arctic ice). Watching them together shows how tightly they are linked. The cause sits at the top of that list and the effects at the bottom, which is why the curves have such similar shapes. Any single chart can be argued about in isolation, but the set is much harder to explain away.
Can I download the climate data behind these charts?
Yes — every indicator page has a Download the data (JSON) link under its chart, giving you the same series the chart is drawn from. Each file carries the source name, the unit, the measurement cadence and the date the snapshot was generated, alongside the values themselves. The underlying records belong to the agencies that produced them, so cite NOAA, the Met Office Hadley Centre, NSIDC or Our World in Data rather than LK Forge. No account is needed to view or download anything here.