The world promised to cut greenhouse gas emissions. These countries aren't meeting their targets.

There is still a huge emissions gap between what's been promised and what scientists say is needed, a report by the UN Environment Programme. shows.

With just five days left until leaders meet at the UN's COP26 climate talks in Glasgow, Scotland, dozens of nations have not yet officially updated their pledges to reduce emissions, as they are supposed to do under the rules of the 2015 Paris Agreement.

Of the G20 countries, which account for 80% of the world's emissions, only six nations have formally increased their targets. The report also found that six G20 nations, including the United States, never met their old targets. The others were Canada, Australia, Brazil, South Korea and Mexico.