In 2016 the Paris Agreement on climate change was signed by most countries, agreeing targets for reduced greenhouse-gas (GHG) emissions. How do we know the level of GHGs in the atmosphere? And how can claims about emission reductions be checked? The answer is global collaboration and teamwork.
The World Data Centre for Greenhouse Gases (WDCGG) is a collection of government agencies, scientific organisations and academic establishments around the world which sample the composition of the atmosphere using a range of methods. By far the biggest contributor to the WDCGG, maintaining a substantial network of its own, is the Global Monitoring Division (GMD) of the National Oceanic and Atmospheric Administration (NOAA), an agency run by the US government.
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