US President Joe Biden is due to address the UN climate summit in Egypt.
He’ll tell the meeting in Sharm el-Sheikh that the US is taking significant action to help keep the rise in global temperatures below 1.5 Celsius.
Mr Biden’s arrival coincides with the publication of research which says the world could pass the threshold within a decade.
The Global Carbon Project says emissions this year will reach a record level.
The United States and others have been urged to do more by poorer countries, including small island states, who are at particular risk from the effects of global warming.
