The United Nations Conference, known as COP27, has started in Egypt.
COP27 will take place in Sharm el-Sheikh in Egypt from 6 to 18 November.
The annual UN climate summits are meant to help governments agree on steps to limit global temperature rises.
Around 90 heads of state are in attendance.
Activist Greta Thunberg will not be attending COP27. She has said she doesn’t agree with how the summit is being run and described it as a forum for “greenwashing”.
Global temperatures have risen 1.1C and are heading towards 1.5C, according to the UN’s climate scientists, the Intergovernmental Panel on Climate Change (IPCC).
If temperatures rise 1.7 to 1.8C above 1850s levels, the IPCC says that half the world’s population could be exposed to life-threatening heat and humidity.
When 194 countries signed the Paris Agreement in 2015 they pledged to “pursue efforts” to limit global temperature rises to 1.5C
It is hoped that countries will discuss this during the conference.