The most detailed ever data about individual facility sources of greenhouse gas emissions worldwide has been unveiled at COP27 in Sharm el-Sheikh, Egypt.

It has revealed the biggest individual greenhouse gas polluters in the world, including Ireland.

It found Dublin Airport, and the aircraft operating in and out of there, was the largest polluter in the country.

The independent data comes primarily from measurements collected by 300 EU, American and Chinese satellites, more than 11,000 land, air and sea-based sensors, as well as the use of artificial intelligence and machine learning.

According to the database, Dublin Airport was the specific source for just over one million tonnes of Ireland's greenhouse gas emissions in 2021.

Daa, which runs the airport, said it was "absolutely committed to playing our part to help Ireland meet its carbon emissions reduction targets".

It added: "As a commercial semi-state company, daa has a firm target to reduce our Scope 1 and 2 emissions by 51% by 2030, in-line with Government-set public sector targets.

"Additionally we are working towards a commitment to achieve Net Zero emissions from our operations by 2050, or sooner.

"As a vital economic enabler, daa has a clear sustainability strategy already in place to deliver key initiatives at Dublin Airport in terms of embracing new technologies, ensuring efficient aircraft operations and implementing smart environmental measures to play our part to reduce carbon emissions."

The second biggest carbon polluter in Ireland is the Drogheda Cement Plant, which spewed out over 983,000 tonnes of greenhouse gases last year.

Third is the cement plant at Ballyconnell in Co Cavan. That was the source of almost 955,000 tonnes of greenhouse gas emissions.

All of these three facilities individually put more climate-changing pollution into the atmosphere than the traffic on Dublin's road network in 2021, which according to new data bank was fourth and the source of 773,000 tonnes of emissions.

The fifth, sixth and seventh sources of Irish greenhouse gas emissions were the Limerick Cement plant, the Whitegate oil refinery in Cork and the Corrib gas field respectively.

These were followed on the league table by the cement plant at Kinnegad, Co Westmeath and Shannon Airport.

The new data bank which has pinpointed more than 70,000 sites was launched by former US vice president Al Gore.

It was put together by an organisation called Climate Trace, a non-profit organisation of artificial intelligence experts, data scientists, researchers, and non-government organisations.

Speaking about the satellite monitoring project, the UN chief Antonio Guterres said it made it harder for countries or companies to "cheat" or "greenwash" their emission levels.

"This should be a wake-up call to governments and the financial sector, especially those that continue to invest in and underwrite fossil fuel pollution," he said.

Using artificial intelligence to analyse data from more than 300 satellites, as well as thousands of sensors on land and in the sea, the Climate TRACE monitor found that the top 14 largest emitters are all oil and gas extraction sites.

Of those, the biggest emitter on the planet is the Permian Basin in Texas, one of the largest oilfields in the world.

"With new data on methane and flaring, we now estimate that the actual emissions are three times higher than what they have reported," Mr Gore said.

Flaring is the burning off of unwanted natural gas from oil and gas wells.

Methane, emitted by leaks from fossil fuel installations as well as from other human-caused sources like livestock and landfills, is responsible for roughly 30% of the global rise in temperatures to date.

Additional reporting by AFP