According to the report titled “Limiting Overshoot: Navigating exceedance of 1.5°C and pathways towards return” released by the UN Environment Programme (UNEP), the global warming threshold of 1.5°C above pre-industrial levels is highly likely to be temporarily breached (overshot) within the next few years.
It states that under an optimistic scenario, global surface temperatures are projected to peak at 1.8°C above pre-industrial levels, whereas current global policies are expected to result in a 2.6°C increase by 2100.