The Annual Greenhouse Gas Index is a measure of the climate-warming influence of long-lived trace greenhouse gases in the atmosphere and how that influence has changed since the onset of the industrial revolution.
Levels of carbon dioxide (CO2), methane and nitrous oxide, the three greenhouse gases emitted by human activity that are the most significant contributors to climate change, continued their historically high rates of growth in the atmosphere during 2022, according to NOAA scientists.
More than 50 years after NOAA commissioned the first Arctic atmospheric observatory in a temporary building at the northernmost point of the United States, NOAA …
NOAA celebrates new Arctic observatory near Utqiaġvik Read More >
The Annual Greenhouse Gas Index serves as a measure of global society’s progress – or lack of progress – in reducing greenhouse gas emissions. Greenhouse gas …
Greenhouse gas pollution trapped 49% more heat in 2021 than in 1990, NOAA finds Read More >
An eight-year study of Boston’s natural gas system has revealed that emissions of methane, a powerful greenhouse gas, are significantly higher than previously estimated. An …
Urban areas across the U.S. are undercounting methane emissions, a new study shows Read More >
The sudden and sustained risesine 2007 in atmospheric levels of the potent greenhouse gas methane has posed one of the most significant and pressing questions in climate research: Where is it coming from?
The annual analysis of samples collected by NOAA’s Global Greenhouse Gas Reference Network provides an updated measure of the excess heat trapped in the atmosphere by greenhouse gas pollution.
The West Coast continental shelf is known to host methane bubble streams, formerly thought to be rare. Now, a new discovery sheds light on the extent and distribution of seafloor methane seeps.
The giant methane cloud spotted by satellite over the U.S. Southwest that made national headlines in 2014 wasn’t a persistent, undiscovered “hotspot” as first thought, but the result of a nightly atmospheric condition and topography that trapped industrial and natural emissions of the potent greenhouse gas near the ground in the basin overnight, according to new research published in the journal Elementa by CIRES and NOAA.
NOAA’s Annual Greenhouse Gas Index tracks the concentrations of greenhouse gases being added to the atmosphere principally from human-caused emissions. The AGGI then calculates the heat being added to Earth's atmosphere and oceans as a result.
