She may be on her way out, but the UK's Prime Minister Theresa May, has committed her country to 'net zero' carbon emissions by 2050, hoping to cement her legacy.
May called the commitment "ambitious but essential" for protecting the Earth.
The move is in line with the 2015 Paris agreement, but climate activists say it's not enough.
They say the world's states must achieve that goal by 2025.
Al Jazeera's Nadim Baba reports.