There's lots of excitement at a climate change meeting in Denmark, after the person heading the talks decided they didn't want to do it anymore.
A Danish politician called Connie Hedegaard had been in charge of the conference in Copenhagen, but now she has resigned from the role.
Denmark's Prime Minister, Lars Løkke Rasmussen, has taken over as president.
And outside the venue where all the world leaders are to meet, hundreds of people have been protesting.
Leah visits a very green school
Police in Denmark have been trying to break up the groups of protesters, who say they are concerned that the talks aren't working.
Wednesday is an important day at the conference, as many world leaders are heading there to try to come up with agreement on what they should do about the world's environment.
The arrival of those world leaders may be one reason for the change in president of the conference, as it means the leader of country is now in charge of the talks.