Science highlights key facts and figures about growing gap between targets and reality
New York, 22 September 2019– The world’s leading climate science organizations have joined forces to produce a landmark new report for the United Nations Climate Action Summit, underlining the glaring – and growing – gap between agreed targets to tackle global warming and the actual reality.
The report, United in Science, includes details on the state of the climate and presents trends in the emissions and atmospheric concentrations of the main greenhouse gases. It highlights the urgency of fundamental socio-economic transformation in key sectors such as land use and energy in order to avert dangerous global temperature increase with potentially irreversible impacts. It also examines tools to support both mitigation and adaptation.
“The Report provides a unified assessment of the state of our Earth system under the increasing influence of anthropogenic climate change, of humanity’s response thus far and of the far-reaching changes that science projects for our global climate in the future. The scientific data and findings presented in the report represent the very latest authoritative information on these topics,” said the Science Advisory Group to the UN Secretary-General’s Climate Action Summit.
“It highlights the urgent need for the development of concrete actions that halt global warming and the worst effects of climate change.”
The Science Advisory Group is co-chaired by WMO Secretary-General Petteri Taalas and Leena Srivastava, former Vice Chancellor of TERI School of Advanced Studies. It comprises highly recognized and respected natural and social scientists, with expertise in different aspects of climate change, including on mitigation and adaptation.
The report, which was coordinated by the World Meteorological Organization, aims to present a “transparent envelope” of authoritative and actionable cutting-edge science.
The synthesis report consists of short summaries from contributing agencies: the World
Meteorological Organization (WMO), Global Atmosphere Watch, the United Nations Environment Programme (UNEP), Global Carbon Project, the Intergovernmental Panel on Climate Change (IPCC), Future Earth, Earth League and the Global Framework for Climate Services. The synthesis is complemented by longer, individual reports, presented as a package to a high-level science event on 22 September and then to world leaders at the Climate Action Summit on 23 September.
Highlights from the report include:
The Global Climate in 2015-2019
World Meteorological Organization (WMO)
Warmest five-year period on record
The average global temperature for 2015–2019 is on track to be the warmest of any equivalent period on record. It is currently estimated to be 1.1°Celsius (± 0.1°C) above pre-industrial (1850–1900) times. Widespread and long-lasting heatwaves, record-breaking fires and other devastating events such as tropical cyclones, floods and drought have had major impacts on socio-economic development and the environment.
Continued decrease of sea ice and ice mass
Arctic summer sea-ice extent has declined at a rate of approximately 12% per decade during 1979-2018. The four lowest values for winter sea-ice extent occurred between 2015 and 2019.
Overall, the amount of ice lost annually from the Antarctic ice sheet increased at least six-fold between 1979 and 2017. Glacier mass loss for 2015-2019 is the highest for any five-year period on record.
Sea-level rise is accelerating, sea water is becoming more acidic
The observed rate of global mean sea-level rise accelerated from 3.04 millimeters per year (mm/yr) during the period 1997–2006 to approximately 4mm/yr during the period 2007–2016. This is due to the increased rate of ocean warming and melting of the Greenland and West Antarctica ice sheets. There has been an overall increase of 26% in ocean acidity since the beginning of the industrial era.
Record Greenhouse Gas Concentrations in the Atmosphere
WMO Global Atmosphere Watch
Levels of the main long-lived greenhouse gases, carbon dioxide (CO2), methane (CH4)) and nitrous oxide (N2O) have reached new highs.
The last time Earth’s atmosphere contained 400 parts per million CO2 was about 3-5 million years ago, when global mean surface temperatures were 2-3°C warmer than today, ice sheets in Greenland and West Antarctica melted, parts of East Antarctica ice had retreated, all causing global see level rise of 10-20m compared with today.
In 2018, global CO2 concentration was 407.8 parts per million (ppm), 2.2 ppm higher than 2017. Preliminary data from a subset of greenhouse gas monitoring sites for 2019 indicate that CO2 concentrations are on track to reach or even exceed 410 parts per million (ppm) by the end of 2019.
In 2017, globally averaged atmospheric concentrations of CO2were 405.6 ±0.1 ppm, CH4) at 1859 ±2 parts per billion (ppb) and N2Oat 329.9 ±0.1 ppb. These values constitute, respectively, 146%, 257% and 122% of pre-industrial levels (pre-1750).
The growth rate of CO2averaged over three consecutive decades (1985–1995, 1995–2005 and 2005–2015) increased from 1.42 ppm/yr to 1.86 ppm/yr and to 2.06 ppm/yr
Global Carbon Budget
Global Carbon Project
Carbon dioxide emissions grew 2% and reached a record high of 37 billion tonnes of CO2in 2018. There is still no sign of a peak in global emissions, even though they are growing slower than the global economy.
Current economic and energy trends suggest that emissions will be at least as high in 2019 as in 2018. Global GDP is expected to grow at 3.2% in 2019, and if the global economy decarbonized at the same rate as in the last 10 years, that would still lead to an increase in global emissions.
Despite extraordinary growth in renewable fuels over the past decade, the global energy system is still dominated by fossil fuel sources. The annual increase in global energy use is greater than the increase in renewable energy, meaning the fossil fuel use continues to grow. This growth needs to halt immediately.
The net-zero emissions needed to stabilize the climate requires both an acceleration in use of non-carbon energy sources and a rapid decline in the global share of fossil fuels in the energy mix. This dual requirement illustrates the scale of the challenge.
NaturalCO2 sinks, such as vegetation and oceans, which remove about half of all emissions from human activities, but will become less efficient at doing so. This underscores the need to reduce deforestation and expand natural CO2 sinks, particularly those in forests and soils that can be improved by better management and habitat restoration.
The emissions gap – where we are and where we need to be
United Nations Environment Programme (UNEP)
The UNEP Emissions Gap Reports, with the tenth edition being published this November, assess the latest scientific studies on current and estimated future greenhouse gas emissions; they compare these with the emission levels permissible for the world to progress on a least-cost pathway to achieve the goals of the Paris Agreement. This difference between “where we are likely to be and where we need to be” is known as the emissions gap.
Global emissions are not estimated to peak by 2030, let alone by 2020, if current climate policies and ambition levels of the Nationally Determined Contributions (NDCs) are maintained. Preliminary findings from the Emissions Gap Report 2019 indicate that greenhouse gas emissions continued to rise in 2018.
The emissions gap in 2030 between emission levels under full implementation of conditional Nationally Determined Contributions (NDCs) and levels consistent with least-cost pathways to the 2°C target is 13 GtCO2e. If just the unconditional NDCs are implemented, the gap increases to 15 GtCO2e. The gap in the case of the 1.5°C target is 29 GtCO2e and 32 GtCO2e respectively.
Current NDCs are estimated to lower global emissions in 2030 by up to 6 GtCO2e compared to a continuation of current policies. This level of ambition needs to be roughly tripled to align with the 2°C limit and must be increased around fivefold to align with the 1.5°C limit.
Implementing unconditional NDCs, and assuming that climate action continues consistently throughout the twenty-first century, would lead to a global mean temperature rise between 2.9°C and 3.4°C by 2100 relative to pre-industrial levels.
If NDC ambitions are not increased immediately and backed up by action, exceeding the 1.5°C goal can no longer be avoided. If the emissions gap is not closed by 2030, it is very plausible that the goal of a well-below 2°C temperature increase is also out of reach.
A substantial part of the technical potential can be realized through scaling up and replicating existing, well-proven policies – such as switching to renewable energy and reforestation – that simultaneously contribute to key sustainable development goals.
Intergovernmental Panel on Climate Change (IPCC)
Three IPCC Special Reports released in 2018 and 2019 assess complementary and specific aspects of climatechange, ahead of the Sixth Assessment Report.
TheSpecial Report on Global Warming of 1.5°Cstates that limiting warming to 1.5ºC is not physically impossible but would require unprecedented transitions in all aspects of society. There are clear benefits to keeping warming to 1.5 ºC compared to 2 ºC or higher. Every bit of warming matters.
Limiting warming to 1.5ºC can go hand in hand with reaching other world goals such as achieving sustainable development and eradicating poverty.
TheSpecial Report on Climate Change and Landstressed that land is already under growing human pressure and climate change is adding to these pressures. At the same time, keeping global warming to well below 2ºC can be achieved only by reducing greenhouse gas emissions from all sectors including land and food.
“The report shows that better land management can contribute to tackling climate change, but land is not the only solution. Reducing greenhouse gas emissions from all sectors including energy is essential if global warming is to be kept as close as possible to 1.5ºC above pre-industrial levels.”
On 25 September 2019, the IPCC is due to release the Special Report on the Ocean and Cryosphere in a Changing Climate.
Climate Insights
Future Earth and Earth League
Consolidated evidence reinforces human influence as the dominant cause of changes to the Earth system, in a new geological epoch, the Anthropocene.
Growing climate impacts increase the risks of crossing critical tipping points. These refer to thresholds that, if crossed, lead to far-reaching, in some cases abrupt and/or irreversible changes.
There is a growing recognition that climate impacts are hitting harder and sooner than climate assessments indicated even a decade ago.
As climate change intensifies, cities are particularly vulnerable to impacts such as heat stress and can play a key role in reducing emissions locally and globally.
Strategies for mitigation and for upscaling adaptive risk management are necessary going forward. Neither is adequate in isolation given the pace of climate change and magnitude of its impacts.
Only immediate and all-inclusive action encompassing: deep de-carbonization complemented by ambitious policy measures, protection and enhancement of carbon sinks and biodiversity, and efforts to remove CO2from the atmosphere, will enable us to meet the Paris Agreement.
Global Framework for Climate Services
Climate and early warning information services should underpin decision-making on climate action for adaptation.
Bonn, 5 October 2016—The UN’s top climate official today praised nations across the globe for acting swiftly to bring the landmark Paris Climate Change Agreement into force.
“This is a truly historic moment for people everywhere. The two key thresholds needed for the Paris Climate Change Agreement to become legal reality have now been met,” said Patricia Espinosa, Executive Secretary of the UN Framework Convention on Climate Change (UNFCCC).
“The speed at which countries have made the Paris’s Agreement’s entry into force possible is unprecedented in recent experience of international agreements and is a powerful confirmation of the importance nations attach to combating climate change and realizing the multitude of opportunities inherent in the Paris Agreement,” she said.
In a statement issued before the threshold for ratification of the Paris Agreement was crossed, UN Secretary-General Ban Ki-moon said: “Strong international support for the Paris Agreement entering into force is testament to the urgency for action, and reflects the consensus of governments that robust global cooperation is essential to meet the climate challenge.”
The Paris Agreement was adopted in Paris, France at the UN climate conference in December 2015. In order to enter into force, at least 55 Parties accounting for at least 55 per cent of global greenhouse gas emissions were required, with the Agreement then entering into force 30 days later.
Today, the UNFCCC secretariat tracker shows that the number of Parties that have ratified, accepted, or approved the Agreement now covers over 55% per cent of global greenhouse gas emissions. This includes the biggest and smallest emitters, the richest and the most vulnerable nations.
“Above all, entry into force bodes well for the urgent, accelerated implementation of climate action that is now needed to realize a better, more secure world and to support also the realization of the Sustainable Development Goals,” Ms. Espinosa said.
“It also brings a renewed urgency to the many issues governments are advancing to ensure full implementation of the Agreement. This includes development of a rule book to operationalize the agreement and how international cooperation and much bigger flows of finance can speed up and scale up national climate action plans,” she added.
Consequences of Entry into Force
Entry into force triggers a variety of important consequences, including launch of the Agreement’s governing body, known as the CMA. In the parlance of the UN climate change process this stands for the Conference of the Parties to the Convention serving as the meeting of the Parties to the Paris Agreement.
Given that the count-down to entry into force has now been formally triggered, the CMA will take place at the upcoming annual UN climate conference, known as COP22, in Marrakesh, Morocco from November 7-18. Precise dates will be announced in the coming days.
Moreover, the Intended Nationally Determined Contributions (INDCs) – national climate action plans – of Parties which have joined or subsequently join the Agreement transform into Nationally Determined Contributions (NDCs), which can always be resubmitted as more ambitious plans at any point. A key feature of the Agreement is that these plans can be strengthened at any time but not weakened.
“Climate action by countries, companies, investors and cities, regions, territories and states has continued unabated since Paris and the full implementation of the agreement will ensure that this collective effort will continue to double and redouble until a sustainable future is secured,” said Ms Espinosa.
Governments will also be obligated to take action to achieve the temperature goals enshrined in the Agreement – keeping the average global temperature rise from pre-industrial times below 2 degrees C and pursuing efforts to limit it to 1.5 degrees.
The fact that somewhere around one degree of this rise has already happened and global greenhouse gas emissions have not yet peaked underlines the urgency of implementing the Paris Agreement in full.
Another key milestone will be the successful conclusion of negotiations to develop the Paris Agreement’s implementation rule book. Completion of what is, in effect, a global blueprint for reporting and accounting for climate action, need to be completed as soon as possible.
Countries are also not starting from scratch. The many successful models and mechanisms for international climate cooperation set up under the UNFCCC over the past two decades, including the Kyoto Protocol, have built up a deep level of experience and knowledge on how this can be done effectively.
It is the completed rule book that will make the Agreement work and that will make it fully implementable, setting out the detailed requirements under which countries and other actors will openly report and account for the climate action they are taking in a way which promotes trust and confidence across nations to boost their own comprehensive response to the challenge of climate change.
Another key issue is to ensure that the $100 billion, pledged by developed countries to developing ones, is truly building in the run up to 2020 and that even larger sums are being leveraged from investors, banks and the private sector that can build towards the $5 to $7 trillion needed to support a world-wide transformation.
Securing a world which is safer from the extreme climate change that would undermine any attempt at future sustainable development will still take decades of rising action and constant improvement.
“The entry into force of the Paris Agreement is more than a step on the road. It is an extraordinary political achievement which has opened the door to a fundamental shift in the way the world sees, prepares for and acts on climate change through stronger action at all levels of government, business, investment and civil society,” said Ms Espinosa.
For more information on status of ratification, a list of the countries who have ratified, accepted, approved or acceded and a question and answer on the Paris Agreement and other related information please go tohttp://unfccc.int/paris_agreement/items/9444.php