The Unavoidable Overshoot: What 1.5°C Warming Means for India's Climate Action and Future

What is the 1.5°C target and why is overshoot now considered 'unavoidable'?

The 1.5°C target, a central goal of the Paris Agreement formally enshrined in Article 2, commits 193 countries and the European Union to keep global average temperatures "well below 2°C above pre-industrial levels" and to pursue efforts to limit the increase to "1.5°C." This lower threshold is significant because climate risks, including extreme heat, drought, and water stress, intensify with every additional fraction of a degree of warming (Source: Indian Express Explained). While 1.5°C was never considered a completely "safe" level, staying closer to it substantially reduces the severity of risks to human populations and ecosystems.

Despite previous assertions that the 1.5°C target was achievable, a new report by the United Nations Environment Programme (UNEP), titled “Limiting Overshoot” and released in early September 2026, concludes that temporarily breaching this limit is now “unavoidable.” The report projects that even under an "optimistic scenario," where governments fully implement current climate plans and net-zero pledges, global temperatures are expected to peak at approximately 1.8°C above pre-industrial levels. Furthermore, if current policies remain unchanged, the globe is poised to heat by 2.6°C (Source: The Hindu Opinion). The 1.5°C goal refers to long-term warming, measured over decades, not the average temperature in any single calendar year; thus, a temporary breach does not automatically signify a permanent failure of the Paris Agreement.

What are the consequences of an overshoot, and can the damage be reversed?

An overshoot of the 1.5°C target, even if temporary, will lead to harmful and long-lasting damage, much of which may be irreversible. The UNEP report highlights that the higher temperatures rise and the longer they remain above 1.5°C, the greater the risk of intensifying extreme heat events, widespread wildfires, significant glacier loss, and severe damage to critical ecosystems such as coral reefs (Source: Indian Express Explained). Some changes are particularly concerning due to their potential for irreversibility, including the collapse of the Greenland and West Antarctic ice sheets, the dieback of the Amazon rainforest, and disruptions to the Atlantic Meridional Overturning Circulation (AMOC), a major system of ocean currents that regulates global climate.