American President Barack Obama has arrived in Denmark for the last day of the Copenhagen climate change conference.
He will be joined later by 118 world leaders, hoping to come to an agreement on how to deal with our warming planet.
Politicians held talks late last night to try and reach a resolution.
Officials in Denmark said there was the chance of an agreement for the first time, but that it still might not be enough to stop a 3C temperature rise.
Yesterday several rich countries have agreed to give cash to help people deal with climate change.
American politician Hilary Clinton has said her government is ready to work with other countries to raise more than £60 billion every year to help poor countries.
But as yet, no-one has said where that money will come from.
