Aviation percentage of global emissions

The European Union Emissions Trading System is a carbon emission trading scheme which began in 2005 and is intended to lower greenhouse gas emissions by the European Union countries.
Cap and trade schemes limit emissions of specified pollutants over an area and allow companies to trade emissions rights within that area.
The EU ETS covers around 45% of the EUs greenhouse gas emissions.

Greenhouse gas emissions by China are the largest of any country in the world both in production and consumption terms, and stem mainly from coal burning in China, including coal-fired power stations, coal mining, and blast furnaces producing iron and steel.
When measuring production-based emissions, China emitted over 14 gigatonnes (Gt) CO2eq of greenhouse gases in 2019, 27% of the world total.
When measuring in consumption-based terms, which adds emissions associated with imported goods and extracts those associated with exported goods, China accounts for 13 gigatonnes (Gt) or 25% of global emissions.

In 2021, net greenhouse gas (GHG) emissions in the United Kingdom (UK) were 427 million tonnes (Mt) carbon dioxide equivalent, 80% of which was carbon dioxide itself.
Emissions increased by 5% in 2021 with the easing of COVID-19 restrictions, primarily due to the extra road transport.
The UK has over time emitted about 3% of the world total human caused CO2, with a current rate under 1%, although the population is less than 1%.

The United States produced 5.2 billion metric tons of carbon dioxide equivalent greenhouse gas (GHG) emissions in 2020, the second largest in the world after greenhouse gas emissions by China and among the countries with the highest greenhouse gas emissions per person.
In 2019 China is estimated to have emitted 27% of world GHG, followed by the United States with 11%, then India with 6.6%.
In total the United States has emitted a quarter of world GHG, more than any other country.
Annual emissions are over 15 tons per person and, amongst the top eight emitters, is the highest country by greenhouse gas emissions per person.
However, the IEA estimates that the richest decile in the US emits over 55 tonnes of CO2 per capita each year.
Because coal-fired power stations are gradually shutting down, in the 2010s emissions from electricity generation fell to second place behind transportation which is now the largest single source.
In 2020, 27% of the GHG emissions of the United States were from transportation, 25% from electricity, 24% from industry, 13% from commercial and residential buildings and 11% from agriculture.
In 2021, the electric power sector was the second largest source of U.S. greenhouse gas emissions, accounting for 25% of the U.S. total.
These greenhouse gas emissions are contributing to climate change in the United States, as well as worldwide.

The European Union Emissions Trading System is a carbon emission trading scheme which began in 2005 and is intended to lower greenhouse gas emissions by the European Union countries.
Cap and trade schemes limit emissions of specified pollutants over an area and allow companies to trade emissions rights within that area.
The EU ETS covers around 45% of the EUs greenhouse gas emissions.

Greenhouse gas emissions by China are the largest of any country in the world both in production and consumption terms, and stem mainly from coal burning in China, including coal-fired power stations, coal mining, and blast furnaces producing iron and steel.
When measuring production-based emissions, China emitted over 14 gigatonnes (Gt) CO2eq of greenhouse gases in 2019, 27% of the world total.
When measuring in consumption-based terms, which adds emissions associated with imported goods and extracts those associated with exported goods, China accounts for 13 gigatonnes (Gt) or 25% of global emissions.

In 2021, net greenhouse gas (GHG) emissions in the United Kingdom (UK) were 427 million tonnes (Mt) carbon dioxide equivalent, 80% of which was carbon dioxide itself.
Emissions increased by 5% in 2021 with the easing of COVID-19 restrictions, primarily due to the extra road transport.
The UK has over time emitted about 3% of the world total human caused CO2, with a current rate under 1%, although the population is less than 1%.

The United States produced 5.2 billion metric tons of carbon dioxide equivalent greenhouse gas (GHG) emissions in 2020, the second largest in the world after greenhouse gas emissions by China and among the countries with the highest greenhouse gas emissions per person.
In 2019 China is estimated to have emitted 27% of world GHG, followed by the United States with 11%, then India with 6.6%.
In total the United States has emitted a quarter of world GHG, more than any other country.
Annual emissions are over 15 tons per person and, amongst the top eight emitters, is the highest country by greenhouse gas emissions per person.
However, the IEA estimates that the richest decile in the US emits over 55 tonnes of CO2 per capita each year.
Because coal-fired power stations are gradually shutting down, in the 2010s emissions from electricity generation fell to second place behind transportation which is now the largest single source.
In 2020, 27% of the GHG emissions of the United States were from transportation, 25% from electricity, 24% from industry, 13% from commercial and residential buildings and 11% from agriculture.
In 2021, the electric power sector was the second largest source of U.S. greenhouse gas emissions, accounting for 25% of the U.S. total.
These greenhouse gas emissions are contributing to climate change in the United States, as well as worldwide.

Increasing methane emissions are a major contributor to the rising concentration of greenhouse gases in Earth's atmosphere, and are responsible for up to one-third of near-term global heating.
During 2019, about 60% of methane released globally was from human activities, while natural sources contributed about 40%.
Reducing methane emissions by capturing and utilizing the gas can produce simultaneous environmental and economic benefits.