Indonesia has agreed to end deforestation by 2030 which is good news for opponents of the country’s palm oil industry.
The country has been criticised for clearing forests for palm oil cultivation used in a range of products including biodiesel production.
The EU has vowed to end palm oil imports from Indonesia and Malaysia which has erupted into a legal row between the parties.
More than 100 world leaders will promise to end and reverse deforestation by 2030 in the COP26 climate summit's first major deal.
Brazil - where stretches of the Amazon rainforest have been cut down - will be among the signatories on Tuesday.
The pledge includes almost £14 billion (€16.5 billion) of public and private funds.
Felling trees contributes to climate change because it depletes forests that absorb vast amounts of the warming gas CO2.
UK Prime Minister Boris Johnson, who is hosting the global meeting in Glasgow, called the deal a “landmark agreement to protect and restore the Earth's forests”.
He said: "These great teeming ecosystems - these cathedrals of nature - are the lungs of our planet," he will say at a COP26 event later where world leaders are meeting to discuss forests and land use.
The two-week summit in Glasgow is seen as crucial if climate change is to be brought under control.
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