The International Energy Agency warned Tuesday that energy policies must evolve if global warming is to be limited to 1.5 degrees Celsius above pre-industrial levels, saying fossil fuel use is still "far too high".

"As things stand, demand for fossil fuels is set to remain far too high to keep within reach the Paris Agreement goal of limiting the rise in average global temperatures to 1.5 degrees C," or 2.7 degrees Fahrenheit, the agency said.

"This risks not only worsening climate impacts after a year of record-breaking heat, but also undermining the security of the energy system, which was built for a cooler world with less extreme weather events," the IEA said in its annual report.

"Bending the emissions curve onto a path consistent with 1.5 degrees Celsius remains possible but very difficult," it said.

Without substantive policy changes worldwide, global average temperatures could rise by around 2.4 Celsius this century, it said.

The report comes just weeks from the Cop 28 summit beginning in November in Dubai, the latest of the global climate summits hosted by the United Nations since 1995 aimed at stabilising greenhouse-gas emissions and climate change.