BBC News Reality Check

During their heated exchanges, Prime Minister Boris Johnson said to Labour Leader Sir Keir Starmer: “Last night, our friends in the European Union voted to approve our Brexit deal, which he opposed.”

If the prime minister is referring to the vote in the House of Commons that followed the deal then that is not correct.

The vote took place on 30 December and was backed by the Commons by 521 to 73 votes after Parliament was recalled.

The Labour leader voted in favour of the legislation on the agreement as did the vast majority of Labour MPs.

The Labour leader had said a "thin deal was better than no deal". He had criticised a number of aspects of the deal.

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At Prime Minister’s Questions, Boris Johnson and Labour leader Keir Starmer clashed over the controversial refurbishment of the DowningStreet flat where the prime minister is living.

Mr Johnson said: “I’d rather not spend taxpayers’ money, by the way, like the last Labour government, which spent £500,000 of taxpayers’ money on the Downing Street flat”.

The figures for annual spending appear in a parliamentary answer from a Cabinet Office minister.

The £500,000 figure is what you get if you adjust rising prices and add up all the spending over the period of Labour governments between 1997 and 2010.

If you take it in cash terms, to reflect the annual £30,000 allowance, there were several years when the spending was over that level.

But the total spending over 13 years was £370,000, which is just under £30,000 a year.

At the climate summit, leaders sought to outbid each other with their pledges on cutting carbon emissions over the next decade.

The numbers can be confusing, so let’s try to make sense of them.

The US pledged to cut carbon emissions by around 50% (from 2005 levels) by 2030.

The UK announced a "world-leading" target to cut emissions by 78% (from 1990 levels) by 2035, having previously committed to 68% by 2030.

Other countries such as Canada have also increased their commitments.

Different countries use different years as the starting point for comparison, usually from when their emissions peaked – partly to show their pledges in the best light.

For example, the US compares their 2030 target to 2005 levels, and the UK uses 1990 levels - about the time when emissions peaked in their respective countries.

However, by either comparison point, the UK’s 2030 target is the most ambitious.

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You can’t see or smell carbon dioxide (CO2) but it’s actually all around us and is at the heart of the world's changing climate.

Scientists believe the last time levels of CO2 in the atmosphere were as high as they are now was probably more than three million years ago.

Reality Check’s Chris Morris explains why limiting the amount of carbon dioxide we use is so important.

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China is the largest overall producer of coal, but at the summit its President Xi Jinping said his country has plans to limit consumption of the fossil fuel and “strictly control” coal fired power projects.

Chinese coal production increased by 4% in 2019, according to the latest statistics available on the Our World in Data website.

After declining during the pandemic year, the use of coal - a key driver of global warming - is predicted to increase in 2021 according to the International Energy Agency.

Among the top countries, coal production rose in Indonesia and by a small amount in Australia.

Australia is a major exporter of fossil fuels and was responsible for the largest amount of coal produced per capita.d

In the same year, overall production fell in the United States and India.