None of the world's major economies -- including the entire G20 -- have a climate plan that meets their obligations under the 2015 Paris Agreement, according to an analysis published Wednesday, despite scientists' warning that deep cuts to greenhouse gas emissions are needed now.

The watchdog Climate Action Tracker (CAT) analyzed the policies of 36 countries, as well as the 27-nation European Union, and found that all major economies were off track to contain global warming to 1.5 degrees Celsius above pre-industrial levels. The countries together make up 80% of the world's emissions.

The analysis also included some low-emissions countries, and found that the Gambia was the only nation among all 37 to be "1.5 compatible." As the study only included a few smaller emitters, it's possible there are other developing countries in the world on track as well.

Under the 2015 Paris accord, more than 190 countries agreed to limit the increase in global temperatures to well below 2 degrees above pre-industrial temperatures -- ideally to 1.5 degrees. Scientists have said 2 degrees is a critical threshold for some of the Earth's ecosystems, and is one that would also trigger more catastrophic extreme weather events.

The report comes less than two months ahead of UN-brokered international climate talks in Glasgow, known as COP26. The event's president, British MP Alok Sharma, has said he hopes to "keep 1.5 alive" as a global warming limit.