Climate activist Greta Thunberg brands UK's claims that they are Climate Leaders as 'a lie'.
The comments come as UNICEF published a report which suggests one billion children are living in one of the 33 countries considered 'extremely high-risk' from climate change.
That's nearly half of the world's population of youngsters.
UNICEF also found that two billion are exposed to high levels of air pollution - with the UK currently ranking 17th for CO2 emissions.
Earlier this year at the Leaders' Climate Summit, the UK's Prime Minister Boris Johnson said the "UK has managed to reduce its CO2 emissions by about 42% on 1990 levels".
Greta Thunberg said this simply wasn't true. The 18-year-old said that "if you don't include all emissions then the statistics are going to look much nicer".
— LBC (@LBC) August 20, 2021
Thunberg gained notoriety from her school climate strike, a movement which has now picked up worldwide traction.
— Greta Thunberg (@GretaThunberg) August 20, 2021
Scientists say extreme heat is an increasingly common occurrence worldwide - with heat-related deaths and illnesses expected to rise.
They want to see a global effort to mitigate climate change and increase people's resilience to extreme temperatures.
They're recommending a number of public health measures - from increasing green space in cities to wall coatings that reflect heat from buildings.