These gases trap heat in the Earth's surface and warm the planet. Different GHGs have different lifetimes, with some short-lived gases present for a few years and some longer-lived gases present for thousands of years. GHGs accumulate in the atmosphere overtime, with each year's emissions added to the preceding year's emissions.New Zealand's share of global GHG emissions is small, but our gross emissions per person are high, remaining relatively unchanged since 2005. In 2019, New Zealand's gross GHG emissions were 82.3 million tonnes of carbon dioxide equivalent (Mt C02-e), comprising 45 carbon dioxide, 42 methane, 10 nitrous oxide and 2 fluorinated gases.The figure above shows the breakdown of New Zealand's 2019 emissions by sector, sub-category, and gas type.
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