How much carbon has been emitted?

As of late 2021, approximately 1.5 trillion metric tons of carbon dioxide (CO2) had been emitted since the onset of the Industrial Revolution in the late 18th century. Annual global emissions are around 36 billion metric tons, but this figure fluctuates due to various factors, including economic activity and energy consumption changes. To get the most accurate and current emissions data, it is advisable to refer to reputable sources like the Global Carbon Project or the Intergovernmental Panel on Climate Change (IPCC).