A dangerous rise in global temperatures above the 1.5C (2.7F) limit set by the UN could happen in just five years, warn scientists.
There is a 40 per cent chance that annual temperature rises will go beyond the level set by the 2015 Paris Agreement, agreed to by 196 countries, it is claimed.
The report published by the World Meteorological Organisation also warns of a very high likelihood – a 90 per cent chance – of at least one year between 2021 and 2025 becoming the warmest on record, outstripping 2016’s record heat.
Global average temperatures of 1.5C (2.7F) above 19th century levels are seen as a threshold beyond which the most dangerous impacts of climate change will be felt.
Scientists warn that temperature rises above 1.5C (2.7F) will lead to more heatwaves, extreme rainstorms, water shortages and drought, greater economic losses and lower crop yields, higher sea levels and destruction of coral reefs.
A dangerous rise in global temperatures above the 1.5C limit set by the UN could happen in just five years, warn scientists (melting ice near Sirmilik National Park on Bylot Island pictured)
KEY FINDINGS FROM THE DECADAL CLIMATE UPDATE
- Annual mean global temperature is likely to be at least 1C (1.8F) warmer than preindustrial levels in each of the coming five years
- It could be as much as 1.8C (3.24F) warmer within the same periods
- It is about as likely as not that one of the next five years will be at least 1.5C (2.7F) warmer than preindustrial levels and the chance is increasing with time
- The chance of at least one year exceeding the current warmest year, 2016, in the next five years is 90%
- Over 2021-2025, almost all regions, except parts of the southern oceans and the North Atlantic are likely to be warmer than the recent past
- Over 2021-2025, high latitude regions and the Sahel are likely to be wetter than the recent past
- There is an increased chance of more tropical cyclones in the Atlantic compared to the recent past
- In 2021, large land areas in the Northern Hemisphere are likely to be over 0.8C (1.44F) warmer than the recent past
- In 2021, the Arctic is likely to have warmed by more than twice as much as the global mean compared to the recent past
- In 2021, southwestern North America is likely to be drier than the recent past whereas the Sahel region and Australia are likely to be wetter
In 2020, the global average temperature was 1.2C (2.16F) above pre-industrial levels, making it among the three hottest years on record.
The predictions appear in the WMO’s Global Annual to Decadal Climate update, which is led by Britain’s Met Office.
WMO secretary general Professor Petteri Taalas said increasing temperatures lead to more melting ice, which leads to higher sea levels.
Changes to sea levels and ice can lead to more heatwaves and other extreme weather events causing a ‘greater impact on food security, health, environment and sustainable development’ around the world.
‘This study shows that we are getting measurably and inexorably closer to the lower target of the Paris Agreement on Climate Change,’ he said.
‘It is yet another wake-up call that the world needs to fast-track commitments to slash greenhouse gas emissions.’
The pledge made by signatories to the Paris Agreement requires them to introduce legislation and take measures to limit global temperature increases.
At the lower level the aim is to keep temperatures from rising by more than 1.5C (2.7F), but studies suggest we will hit that within the next five years, pushing efforts towards ensuring we stay below the 2C (3.6F) upper limit of the pledge.
These temperature limits are global averages before the industrial revolution began to pour greenhouse gasses into the atmosphere and are set to a level that would reduce the risks and impacts of climate change from being too severe.
Current action promised by countries puts the world on track for 2-3C (3.6-5.4F) of warming by the end of the century.
Dr Stephen Cornelius, chief climate adviser at WWF, said limiting global warming to 1.5C (2.7F) is of ‘critical importance’ to prevent the worst climate change impacts.
‘But we know without global action we are at risk of reaching this threshold in the coming years,’ he added.
‘With so much at stake, governments must take urgent action to cut harmful emissions.’
The new WMO update confirms the rising temperature trend, finding that the mean global temperature will be at least 1C (1.8F) warmer and up to 1.8C (3.2F) warmer than pre-industrial levels within the next five years.
The chance of temporarily reaching 1.5C (2.7F) has roughly doubled compared to last year’s predictions, the report revealed.
This isn’t down to any change in behaviour, but rather due to improved datasets, allowing for a more accurate assessment and predictions.
A global rise in temperatures will lead to a wider range of extreme weather events including flooding, droughts, cyclones and ice sheet melting
In 2020, the global average temperature was 1.2C above pre-industrial levels, making it among the three hottest years on record (factory in Texas pictured)
It also doesn’t mean that temperatures will consistently be 1.5C (2.7F) above pre-industrial levels for the next five years. It is more that we will ‘hit’ that point.
Professor Adam Scaife, head of seasonal to decadal prediction at the Met Office, said the study looks at long-term global averages, not those in each year or month.
‘Nevertheless, a temporary exceedance of the 1.5 degree level may already be seen in the next few years,’ he said.
The year 2021, and the crucial climate change negotiations, COP26, in November, have been widely described as a “make-or-break” chance to prevent climate change spiralling ever more out of control.
Tackling climate change is high on the agenda of the G-7 Leaders Summit hosted by the UK next month, with prime minister Boris Johnson already confirming a tougher climate pledge – to slash emissions by 78 per cent of 1990 levels by 2035.
THE KEY GOALS OF THE PARIS CLIMATE AGREEMENT
The Paris Agreement on Climate Change has four main goals with regards to reducing emissions:
1) A long-term goal of keeping the increase in global average temperature to well below 2°C above pre-industrial levels
2) To aim to limit the increase to 1.5°C, since this would significantly reduce risks and the impacts of climate change
3) Goverments agreed on the need for global emissions to peak as soon as possible, recognising that this will take longer for developing countries
4) To undertake rapid reductions thereafter in accordance with the best available science
Source: European Commission