The study also found all frozen and unfrozen soil in northern permafrost regions contains a combined 1,656 gigagrams
of mercury, making it the largest known reservoir of mercury on the planet.
The study estimated methane emissions from the sector at 1,503 gigagrams
per year (Gg/year), compared with 2,071 Gg/year reported in the Environmental Protection Agency's (EPA) 2012 Greenhouse Gas Inventory.
The statements mentioned above indicate that the greenhouse gases (CO2, methane, nitrous oxide) in the Republic of Yemen emitted by all sectors are about 18,709 equivalent gigagrams
per day, equivalent to 57,000 [+ or -] 9,800 barrels of oil per day, and was accompanied by 2.
X]) emissions for nineteen European countries for 1980-2000 measured in gigagrams