UNEP Maps A Return Below 1.5°C As Emissions Cuts And Carbon Removal Face A Harder Test

Global greenhouse gas emissions must fall sharply this decade to limit how far and how long warming exceeds 1.5 degrees Celsius above preindustrial levels, according to a new UN Environment Programme assessment that sets out a possible return below that level by 2100.

Released publicly on Oct. 21, the Emissions Gap Report 2026 examines a lower-overshoot pathway in which warming peaks at about 1.7 to 1.8 C around mid-century. It gives that pathway roughly a 50% chance of returning to or below 1.5 C by the end of the century.

The scenario requires global emissions reductions of 18% by 2030, 45% by 2035 and 69% by 2040, all measured against 2025. Those percentages use the same baseline; they are not successive cuts from each preceding target year.

UNEP says current policies imply warming of about 2.8 C this century. Full delivery of countries' nationally determined contributions, with comparable efforts continuing, would limit warming to about 2.6 C. The figures describe different assumptions about future action, rather than three interchangeable forecasts.

Overshoot Adds A Second Task

The report's executive summary separates cutting emissions from removing carbon dioxide already in the atmosphere. The first limits the accumulation driving further warming; the second becomes necessary in pathways that bring temperatures back after an overshoot.

That creates a practical difference between a promise to offset future emissions and a demonstrated reduction today. A removal method must work at the required scale and keep carbon out of the atmosphere for the intended period. Land, energy and financing requirements can also constrain deployment.

The report identifies major technological and socioeconomic uncertainty around the carbon removal required over the century. A pathway that includes removal is therefore not evidence that the future capacity is already available.

Nor does returning to a temperature level erase every consequence of the intervening years. The Intergovernmental Panel on Climate Change's synthesis assessment explains that climate risks increase with additional warming and that some changes can be irreversible on human timescales.

For planning, the duration and height of an overshoot both matter. A later temperature decline would not mean that floods, heat impacts or ecosystem losses experienced along the way had never occurred.

Separate A Policy Target From A Delivered Result

UNEP's explanation of the findings says that delaying reductions makes the remaining task harder. It also points to growth in renewable energy and evidence that climate policies have reduced emissions in specific countries and sectors.

That distinction provides a way to assess a new project or policy announcement. A target states what should happen, an investment commitment describes planned spending and a measured emissions result records what has happened. Each can be useful, but they answer different questions.

For a business, an electricity-sourcing claim also needs a boundary and a period. A statement about one facility in one year cannot automatically establish the performance of a whole corporate group or its supply chain.

The same principle applies to national figures. The percentage reduction, base year and gases covered must be clear before one country's commitment can be compared with another's or with a global pathway.

Implications For Investment And Resilience

Malaysia's manufacturers, infrastructure operators and financial institutions face decisions with long-lived consequences. Equipment installed today can affect energy use for years, while buildings and networks have to function through changing weather conditions.

Mitigation and adaptation address different parts of that problem. Reducing emissions limits future warming; preparing drainage, health services or workplaces for climate hazards addresses exposure to changes that are already occurring or remain possible.

A stronger mitigation pathway does not make adaptation unnecessary. Conversely, a successful flood defence does not by itself reduce the emissions that contribute to global warming.

The report does not assign a uniform 18% cut to every Malaysian company. Its headline percentage is a global pathway, and decisions at a national or business level require more specific information about responsibilities, feasible measures and actual emissions.

The immediate message is that the temperature outcome remains sensitive to what governments and markets deliver. The assessment offers a demanding route back from overshoot, with near-term reductions carrying weight that cannot be transferred entirely to uncertain removals later in the century.