Governments will come together this Sunday to discuss action on climate change.
This year's summit - known as COP27 - is being held in Egypt.
With the details, here's our World News Editor Kate Gregan.
These UN climate summits are held every year.
The idea is to bring world leaders together -- then, in practice -- they agree on steps to limit global temperature rises.
They're referred to as COPs, which stands for "Conference of the Parties".
The parties that attend are countries that signed up to the original UN climate agreement in 1992.
But COP27 follows a year of climate-related disasters and broken temperature records.
So, the UN has now issued a stark warning - the planet needs our help.
"For the past 4 ½ billion years planet earth has been thriving, growing and constantly evolving and while we have only been around for thousands of years some of what we've done is irreparable."
UN climate scientists say global temperatures have risen 1.1 degrees, and are heading towards 1.5.
If temperatures rise past that - to 1.8 degrees - it's thought half the world's population could be exposed to life-threatening heat and humidity.
"In today's rapidly warming world the climate crisis won't wait for anyone. That's where you come in. You can help give the earth a fighting chance and the time to do so is right now."
This will be the fifth time a COP has been hosted in Africa.
The region's governments hope it will draw attention to the severe impacts of climate change on the continent.
Currently, 17 million people are thought to be facing food insecurity in east Africa because of drought.
Listen to Kate's World News package above.
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