(CNN)China and the United States are the world's two biggest greenhouse gas emitters, so any attempt to address the climate crisis will need to involve deep emissions cuts from these two powerhouse nations.
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China's emissions are more than double those of the US, but historically, the US has emitted more than any other country in the world.
There are many factors to consider when judging a country's climate credentials, and as leaders gather in Glasgow, Scotland for COP26 from Sunday, the US' and China's plans will be in the spotlight.
Here's how the two stack up against each other.
In 2006, China overtook the US as the world's biggest emitter of carbon dioxide (CO2) -- the most abundant greenhouse gas in the atmosphere.
In 2019, the last year before the pandemic hit, China's greenhouse gas emissions were nearly 2.5 times that of the US', and more than all the world's developed countries combined, according to an analysis from Rhodium Group.
In terms of CO2-equivalent -- which is a way of measuring all greenhouse gases as if they were CO2 -- China emitted 14.1 billion metric tons in 2019. That's more than a quarter of the world's total emissions.
By contrast, the US was responsible for 5.7 billion tons, 11% of total emissions, followed by India (6.6%) and the European Union (6.4%).
When scientists measure greenhouse gas emissions, they look at the total emissions that a country pumps into the air on their own land every year. Those emissions come from anything powered by fossil-fuels, including driving cars that run on gasoline, flying, heating and lighting buildings with power generated from coal, natural gas or oil, as well as from powering industry. Other sources, like emissions from deforestation, are included too.
The US is the biggest historical emitter
Historical emissions are closely linked to current levels of global warming. While China is the world's biggest emitter today, the US led every country until recently. Cumulatively, the US has emitted almost twice as much CO2 as China since 1850.
Cumulative CO2 emissions in million tons
Note: Cumulative CO2 emissions from fossil fuels, land use and forestry in million tons (1850-2021).
Source: Carbon Brief
No country in the world has put more greenhouse gases into the atmosphere than the United States. And by a long way.
While China is by far the biggest emitter today, it hasn't always been. And that's important because emissions released even hundreds of years ago have contributed to global warming today. The world has already warmed by 1.2 degrees Celsius since the start of the Industrial Revolution, and scientists say we need to keep it to 1.5 degrees to stave off worsening impacts of the climate crisis.
China's CO2 emissions began accelerating in the 2000s as the country rapidly developed. Advanced countries, like the US, UK and many in Europe, have been industrializing -- and emitting climate-altering gases in the process -- for around 200 years. A lot of the comforts of living in a developed country have come at the cost of the climate.
Since 1850, China has emitted 284 billion tons of CO2, according to new analysis by Carbon Brief, a UK-based organization covering climate, energy and policy.
The US, on the other hand, industrialized decades earlier and has released 509 billion tons of CO2 -- twice as much.
China is a huge country of 1.4 billion people, so it makes sense it would emit more than smaller nations overall. But when you look at emissions per capita, the average Chinese person emits quite a bit less than the average American.
In 2019, China's per capita emissions reached 10.1 tons. By comparison, the US reached 17.6 tons, according to the Rhodium Group.
This in part comes down to lifestyle. Americans earn more money, they own more gas-guzzling cars, and they fly more than the average Chinese person, according to Climate Transparency's 2021 report, citing independent energy research company Enerdata.
That's not to say China shouldn't be slashing emissions. China's per capita carbon footprint is rapidly catching up with those of wealthier nations -- in the past 20 years, it's nearly tripled.
In 2020, fossil fuels made up 87% of China's domestic energy mix, with 60% from coal, 20% from oil and 8% from natural gas, according to Enerdata.
In the US, 80% of the energy mix comes from fossil fuels. Of that, 33% is from oil, 36% from natural gas, and 11% from coal, Enerdata figures showed.
Natural gas produces fewer emissions than coal, but it is still harmful to the climate, and there are growing concerns that the US and other parts of the world are investing too heavily in gas instead of renewables.
China is the world's biggest user and producer of coal, consuming more than half the world's supply. That's in part because China produces so many products and materials for the world, which is why it's sometimes referred to as "the world's factory."
China produces more than half of the world's steel and cement, which is made from burning coking coal. Alternative fuels for these heavy industries, like green hydrogen, are in development but are not widely available yet at scale. The emissions from just those two industries in China are higher than the European Union's total CO2 emissions, according to the International Energy Agency (IEA).
To reach net zero by 2050, 90% of global electricity generation should come from renewable sources, with solar and wind accounting for nearly 70%, according to the IEA.
While China is the world's biggest emitter and still relies heavily on coal, it is producing huge amounts of renewable energy as well.
In terms of energy mix, China and the US are around the same. Wind, solar, hydro-power, geothermal, as well as biomass and waste, make up 10% of China's energy consumption.
The US was not far off, at 9%. But nearly half of that is from biomass, which is energy derives from substance that were recently alive, like wood from trees, algae or animal waste. Some experts and scientists argue isn't always truly renewable.
But because China uses much more power overall, it has produced more renewable energy than the US in real terms. In 2020, China produced 745,000 gigawatt-hours of energy from wind and solar, according to Enerdata. The US produced 485,000 gigawatt-hours.
In terms of capacity, however, China was the global leader in 2020, when it built nearly half of all the world's renewables installations, according to the Renewables 2021 Global Status Report. It nearly doubled its capacity from 2019.
China has built vast solar and wind farms -- producing more solar PVs and wind turbines than any other nation. It also has the biggest electric vehicle market, taking 38.9% of the global share of electric car sales, while the US took 9.9%, the renewables report said.
So, what's the verdict?
Looking ahead, the US' climate plans are more ambitious than China's -- US President Joe Biden has pledged to at least halve US emissions by 2030, from 2005 levels -- but China is at a different stage of development, so that should be a factor in working out what the country's fair share of climate action should be. China is also ahead of the US on renewables.
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It's also yet to be seen how much of the US Democrats' cornerstone climate policy can make it through Congress.
China expresses its commitments in terms of "carbon intensity" which allows for more emissions the more its GDP rises, which makes it difficult to compare to the US'. It submitted its new emissions plan to the UN on Thursday, but made only a modest improvement.
Climate Action Tracker, which synthesizes countries' targets, rates the US' domestic policies as better than China's, almost on track to contain global warming to 2 degrees Celsius. When adjusted to consider what would be each country's fair share, they both get a 'highly insufficient" rating.
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