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Coral reef resilience key to support the underwater cities threatened by climate change

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The world is figuring out how to move forward in the face of the COVID-19 pandemic by finding newer ways to support economic development, animal and human well being, and ecosystem integrity. As the priority in many parts of the world is to stay home, safe and healthy, work continues to address the ongoing crisis of nature loss which also threatens long-term health and prosperity. In fact, nature, now more than ever, is sending warning signals calling for our attention.

One such warning is from the Great Barrier Reef along Australia’s northeast coast. In March 2020, the area suffered a third mass coral bleaching event in five years due to increasingly warmer temperatures recorded in February 2020.

There have also been reports that widespread bleaching in the first quarter of the year has also occurred in East Africa.

Coral reef scientists predict that bleaching events will be more frequent, more widespread and more severe. For instance, the 2017 Coral Bleaching Futures report by the United Nations Environment Programme (UNEP) predicted, “Increasingly coral bleaching would be among the greatest threats to coral reefs due to climate change.” Annual Severe Bleaching (ASB) is projected to occur within this century for 99 per cent of the world’s coral reefs. The average projected year of ASB is 2043, the report adds.

A report by the Intergovernmental Panel on Climate Change published in October 2018 warns that, even if we collectively manage to stabilize global surface temperatures to 1.5°C above pre-industrial levels, 70 to 90 per cent of coral reefs will be lost by the middle of this century.

Leticia Carvalho, Head of UNEP’s Marine and Fresh Water Branch says: “Scientists have been telling us for a while that coral bleaching events would become more frequent with anthropogenic climate change and warming oceans. Unfortunately, their worst predictions have come to pass. Mass coral bleaching events are like nature’s fire alarm, a stark reminder that climate change is happening and is already impacting our societies and global ecosystem”.

To date the Great Barrier Reef—a UNESCO World Heritage Site, known for its vast mosaic patterns of reefs, islands and coral cays visible from space—has suffered six mass bleaching events due to warmer than normal ocean temperatures: in 1998, 2002, 2006, 2016, 2017 and now 2020. A statement by the Great Barrier Reef Marine Park Authority shows climate change remains the single greatest challenge to the Reef. It is home to the world’s largest collection of coral reefs, with 400 species of coral, 1,500 species of fish and 4,000 types of mollusk.

Bleaching occurs when coral—tiny animals that secrete calcium carbonate for protection—become stressed by factors such as warm water or pollution. As a result of the stress, they expel the microscopic symbiotic algae called zooxanthellae, which reside within their tissues. The corals then turn ghostly white; they become ‘bleached’ (watch these coral bleaching explainer videos). The zooxanthellae are the primary food source for corals. If the algae do not return to the corals as soon as possible (or if temperatures get warmer), the corals can die as it happened in the Great Barrier Reef in 2016 and 2017.

Corals have been observed to glow in luminescent colours—blue, yellow and purple— to protect themselves, like a sunscreen, during extreme ocean heat waves before they die. The phenomenon has sparked the Glowing Gone Campaign in which UNEP has partnered with The Ocean Agency, among other leading ocean conservation organizations.

“It is important to remember bleached corals are not dead corals — on mildly or moderately bleached reefs there is a good chance most bleached corals will recover and survive this event. Equally, on severely bleached reefs, there will be higher mortality of corals,” adds the statement from the lead management agency for the Reef. However, some pockets of the Reef remain unaffected.

Coral reefs, like underwater cities, support a quarter of all marine life – potentially up to 1 million species. They provide at least half a billion people with food security and livelihoods. They also protect coastlines from increasing damage by buffering shorelines against waves, storms and floods, preventing loss of life, property damage and erosion.

“Understanding the different responses of coral reefs to bleaching events is critical for managing coral reefs in a changing climate. Coral reefs are naturally resilient ecosystems, and have been observed to recover well after mortality events if they are given the chance to and other stressors are reduced. This means better water quality, reduced pollution, and sustainable fishing,” says Ms Carvalho.

Supporting coral reefs to be resilient entails reducing coral reef vulnerability to climate change and other stressors.

The bleaching event comes at a time when this year’s World Environment Day, celebrated on June 5, is focused on biodiversity. The day calls for increased awareness and understanding of what biodiversity is and how it provides the vital services that sustain all life on earth. Coral have the highest biodiversity of any ecosystem on the planet—even more than a tropical rainforest.

Further, coral protection speaks to the UN Decade on Ecosystem Restoration (2021-2030) geared towards the restoration of degraded and destroyed ecosystems to fight the climate crisis and enhance food security, water supply and biodiversity.

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Climate Action: It’s time to make peace with nature

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The UN Secretary-General, António Guterres, has described the fight against the climate crisis as the top priority for the 21st Century, in a passionate, uncompromising speech delivered on Wednesday at Columbia University in New York.

The landmark address marks the beginning of a month of UN-led climate action, which includes the release of major reports on the global climate and fossil fuel production, culminating in a climate summit on 12 December, the fifth anniversary of the 2015 Paris Climate Agreement.

Nature always strikes back

Mr. Guterres began with a litany of the many ways in which nature is reacting, with “growing force and fury”, to humanity’s mishandling of the environment, which has seen a collapse in biodiversity, spreading deserts, and oceans reaching record temperatures.

The link between COVID-19 and man-made climate change was also made plain by the UN chief, who noted that the continued encroachment of people and livestock into animal habitats, risks exposing us to more deadly diseases.

And, whilst the economic slowdown resulting from the pandemic has temporarily slowed emissions of harmful greenhouse gases, levels of carbon dioxide, nitrous oxide and methane are still rising, with the amount of CO2 in the atmosphere at a record high. Despite this worrying trend, fossil fuel production – responsible for a significant proportion of greenhouse gases – is predicted to continue on an upward path.

‘Time to flick the green switch’

The appropriate global response, said the Secretary-General, is a transformation of the world economy, flicking the “green switch” and building a sustainable system driven by renewable energy, green jobs and a resilient future.

One way to achieve this vision, is by achieving net zero emissions (read our feature story on net zero for a full explanation, and why it is so important). There are encouraging signs on this front, with several developed countries, including the UK, Japan and China, committing to the goal over the next few decades.

Mr. Guterres called on all countries, cities and businesses to target 2050 as the date by which they achieve carbon neutrality – to at least halt national increases in emissions – and for all individuals to do their part.

With the cost of renewable energy continuing to fall, this transition makes economic sense, and will lead to a net creation of 18 million jobs over the next 10 years. Nevertheless, the UN chief pointed out, the G20, the world’s largest economies, are planning to spend 50 per cent more on sectors linked to fossil fuel production and consumption, than on low-carbon energy.

Put a price on carbon

For years, many climate experts and activists have called for the cost of carbon-based pollution to be factored into the price of fossil fuels, a step that Mr. Guterres said would provide certainty and confidence for the private and financial sectors.

Companies, he declared, need to adjust their business models, ensuring that finance is directed to the green economy, and pension funds, which manage some $32 trillion in assets, need to step and invest in carbon-free portfolios.

Far more money, continued the Secretary-General, needs to be invested in adapting to the changing climate, which is hindering the UN’s work on disaster risk reduction. The international community, he said, has “both a moral imperative and a clear economic case, for supporting developing countries to adapt and build resilience to current and future climate impacts”.

Everything is interlinked

The COVID-19 pandemic put paid to many plans, including the UN’s ambitious plan to make 2020 the “super year” for buttressing the natural world. That ambition has now been shifted to 2021, and will involve a number of major climate-related international commitments.

These include the development of a plan to halt the biodiversity crisis; an Oceans Conference to protect marine environments; a global sustainable transport conference; and the first Food Systems Summit, aimed at transforming global food production and consumption.

Mr. Guterres ended his speech on a note of hope, amid the prospect of a new, more sustainable world in which mindsets are shifting, to take into account the importance of reducing each individual’s carbon footprint.

Far from looking to return to “normal”, a world of inequality, injustice and “heedless dominion over the Earth”, the next step, said the Secretary-General, should be towards a safer, more sustainable and equitable path, and for mankind to rethink our relationship with the natural world – and with each other.

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The race to zero emissions, and why the world depends on it

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A host of countries have recently announced major commitments to significantly cut their carbon emissions, promising to reach “net zero” in the coming years. The term is becoming a global rallying cry, frequently cited as a necessary step to successfully beat back climate change, and the devastation it is causing.

What is net zero and why is it important?

Put simply, net zero means we are not adding new emissions to the atmosphere. Emissions will continue, but will be balanced by absorbing an equivalent amount from the atmosphere.

Practically every country has joined the Paris Agreement on climate change, which calls for keeping the global temperature to 1.5°C above pre-industrial era levels. If we continue to pump out the emissions that cause climate change, however, temperatures will continue to rise well beyond 1.5, to levels that threaten the lives and livelihoods of people everywhere.

This is why a growing number of countries are making commitments to achieve carbon neutrality, or “net zero” emissions within the next few decades. It’s a big task, requiring ambitious actions starting right now.

Net zero by 2050 is the goal. But countries also need to demonstrate how they will get there. Efforts to reach net-zero must be complemented with adaptation and resilience measures, and the mobilization of climate financing for developing countries.

So how can the world move toward net zero?

The good news is that the technology exists to reach net zero – and it is affordable.

A key element is powering economies with clean energy, replacing polluting coal – and gas and oil-fired power stations – with renewable energy sources, such as wind or solar farms. This would dramatically reduce carbon emissions. Plus, renewable energy is now not only cleaner, but often cheaper than fossil fuels.

A wholesale switch to electric transport, powered by renewable energy, would also play a huge role in lowering emissions, with the added bonus of slashing air pollution in the world’s major cities. Electric vehicles are rapidly becoming cheaper and more efficient, and many countries, including those committed to net zero, have proposed plans to phase out the sale of fossil-fuel powered cars.

Other harmful emissions come from agriculture (livestock produce significant levels of methane, a greenhouse gas). These could be reduced drastically if we eat less meat and more plant-based foods. Here again, the signs are promising, such as the rising popularity of “plant-based meats” now being sold in major international fast-food chains.

What will happen to remaining emissions?

Reducing emissions is extremely important. To get to net zero, we also need to find ways to remove carbon from the atmosphere. Here again, solutions are at hand. The most important have existed in nature for thousands of years.

 These “nature-based solutions” include forests, peatbogs, mangroves, soil and even underground seaweed forests, which are all highly efficient at absorbing carbon. This is why huge efforts are being made around the world to save forests, plant trees, and rehabilitate peat and mangrove areas, as well as to improve farming techniques.

Who is responsible for getting to net zero?

We are all responsible as individuals, in terms of changing our habits and living in a way which is more sustainable, and which does less harm to the planet, making the kind of lifestyle changes which are highlighted in the UN’s Act Now campaign.

The private sector also needs to get in on the act and it is doing so through the UN Global Compact, which helps businesses to align with the UN’s environmental and societal goals.

It’s clear, however, that the main driving force for change will be made at a national government level, such as through legislation and regulations to reduce emissions.

Many governments are now moving in the right direction. By early 2021, countries representing more than 65 per cent of global carbon dioxide emissions and more than 70 per cent of the world economy, will have made ambitious commitments to carbon neutrality. 

The European Union, Japan and the Republic of Korea, together with more than 110 other countries, have pledged carbon neutrality by 2050; China says it will do so before 2060.

Are these commitments any more than just political statements?

These commitments are important signals of good intentions to reach the goal, but must be backed by rapid and ambitious action. One important step is to provide detailed plans for action in nationally determined contributions or NDCs. These define targets and actions to reduce emissions within the next 5 to 10 years. They are critical to guide the right investments and attract enough finance.

So far, 186 parties to the Paris Agreement have developed NDCs. This year, they are expected to submit new or updated plans demonstrating higher ambition and action. Click here to see the NDC registry.

Is net zero realistic?

Yes! Especially if every country, city, financial institution and company adopts realistic plans for transitioning to net zero emissions by 2050.

The COVID-19 pandemic recovery could be an important and positive turning point. When economic stimulus packages kick in, there will be a genuine opportunity to promote renewable energy investments, smart buildings, green and public transport, and a whole range of other interventions that will help to slow climate change.

But not all countries are in the same position to affect change, are they?

That’s absolutely true. Major emitters, such as the G20 countries, which generate 80 per cent of carbon emissions, in particular, need to significantly increase their present levels of ambition and action.

Also, keep in mind that far greater efforts are needed to build resilience in vulnerable countries and for the most vulnerable people; they do the least to cause

climate change but bear the worst impacts. Resilience and adaptation action do not get the funding they need, however.

Even as they pursue net zero, developed countries must deliver on their commitment to provide $100 billion dollars a year for mitigation, adaptation and resilience in developing countries.

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EU greenhouse gas emissions fell in 2019 to the lowest level in three decades

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The Commission today adopted its annual EU Climate Action Progress Report, covering the EU’s progress in cutting greenhouse gas emissions in 2019. Greenhouse gas emissions in the EU-27 decreased by 3.7 % year-on-year, while GDP grew by 1.5%. Emissions have now been reduced by 24% compared to 1990 levels.  

Frans Timmermans, Executive Vice-President for the European Green Deal, said: “The European Union is proving it is possible to reduce emissions and grow your economy. However, today’s report again confirms we need to step up our efforts across all sectors of the economy to reach our common goal of climate neutrality by 2050. The transition is feasible if we stick to our commitment and seize the opportunities of the recovery to reboot our economy in a greener, more resilient way and create a healthy, sustainable future for all.”

Emissions covered by the Emissions Trading System (EU ETS) saw the greatest reduction in 2019, dropping by 9.1%, or about 152 million tonnes carbon dioxide equivalent (Mt CO2eq), compared to 2018. This drop was driven mainly by the power sector, where emissions fell by almost 15%, primarily due to coal-fired electricity production being replaced by electricity production from renewables and gas. Emissions from industry decreased by close to 2%. Verified emissions from aviation, which currently only cover flights within the European Economic Area, continued to grow modestly, increasing by 1%, or about 0.7 Mt CO2eq, compared to 2018. Emissions that are not covered by the EU ETS, such as those from non-ETS industry, transport, buildings, agriculture and waste, saw no significant change compared to 2018 levels.

EU expenditure on climate action, financing of green technologies, deployment of new solutions and international cooperation increased in 2019, and will see a further increase in the context of Europe’s recovery from COVID-19.

EU ETS auction revenue is an increasingly important source of climate financing. The total revenue received by Member States, the UK and EEA countries from the auctions between 2012 (the start of auctioning under the EU ETS) and mid-2020 was over €57 billion, with more than half generated in 2018 and 2019 alone. In 2019, total auction revenue exceeded €14.1 billion. Of this total, 77% will be used for climate and energy purposes, 7 percentage points higher than the 70% share reported in 2018. In addition, a growing number of EU-funded climate projects are financed through the monetisation of emission allowances via the NER 300 programme, the Innovation Fund and the Modernisation Fund.

Background

The Climate Action Progress Report “Kick-Starting the Journey Towards A Climate Neutral Europe” describes progress made by the EU and its Member States in reducing greenhouse gas emissions, as well as reporting on recent developments in EU climate policy. The report is produced by the Commission’s Directorate-General for Climate Action based on data submitted by Member States under the Climate Monitoring Mechanism Regulation (MMR, Regulation No 525/2013).

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