Scientists have been warning, for over a decade, that atmospheric carbon dioxide (CO2) concentrations of more than 450 parts per million (ppm) risk triggering extreme weather events and global average temperatures more than 2 degrees C above pre-industrial levels, beyond which the effects of global heating are likely to become catastrophic and irreversible.
Carbon dioxide levels in April 2021 reached 421 ppm and the last decade has been the warmest on record with temperatures reaching a high of nearly 1.4 degrees C above pre-industrial levels. So time is running out and we are all now being challenged to limit this global heating to 1.5 degrees C, which is linked to a CO2 level of 430 ppm, if we are to avoid the worst impacts of climate change.
Use this interactive graph to track key climate change indicators (carbon dioxide, methane, nitrous oxide, oxygen and sea levels as well as global temperatures). Click the icon at the top right of the graph to see the menu.
Carbon Dioxide Visualisation
Click on the video below to see a visualisation of how the levels of atmospheric CO2 (as measured at the Mauna Loa observatory in Hawaii) have built up year-on-year over the last decade - right up to the present day.