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They are due to meet in Glasgow, Scotland, in the first two weeks November for the next round of UN climate talks, to make more ambitious pledges to keep the 1.5C limit within reach.

But scientists said last month that without urgent moves to cut emissions, the average global temperature is likely to hit or cross the 1.5C threshold within 20 years.

ETC said the actions are either close to costless, or entail costs which rich, developed countries could afford domestically, adding that if they need to be implemented by lower income nations, the cost should be covered by support from richer ones.

"A 1.5c pathway is not yet out of reach: but we are running out of time to make it attainable. COP26 can act as a crucial catalyst to deliver the actions required in order to achieve this," the ETC report added.

Scientists say around 40 per cent of global warming so far has been caused by methane, rather than carbon dioxide emissions.

"COP26 should be used as an opportunity to launch an initiative to reduce annual (methane) emissions by at least 150 million tonnes by 2030," the ETC report said.

Action to halt deforestation and begin reforestation is also needed as 3.6 gigatonnes of carbon dioxide annual emissions could be eliminated by 2030 if deforestation was ceased.

The phase-out of coal-fired power generation needs to be speeded up. There needs to be clear international agreement to build no new coal plants, scrapping most of the 300 gigawatts of new coal pipeline capacity in place today.

Agreement to ban all sales of internal combustion engine light-duty vehicles by 2035, combined with city-based action to restrict use of these vehicles which exist now beyond certain dates, could lead to 20 per cent of cars on the road being electric and deliver around 2 gigatonnes of CO2 reductions by 2030.

Heavy transport, heavy industry and buildings also need to be decarbonised faster and energy efficiency improved, it said.

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