How the World is Taming Aircraft Impact
Let’s talk aviation emissions. Air travel connects the world. However, it also creates a growing climate challenge. Every flight burns fuel. Consequently, commercial aircraft release carbon dioxide directly into the atmosphere. Aircraft also produce other emissions at high altitudes, which can increase aviation’s overall warming effect.
At the same time, governments have struggled to decide who should regulate those emissions. Airlines cross borders every day. Therefore, one country’s climate rules can quickly affect carriers based thousands of miles away.
That conflict nearly triggered something much bigger.
Aviation Emissions and the Fight Over Climate Change
An agreement sealed by 191 nations at an International Civil Aviation Organization meeting helped avert, at least temporarily, what threatened to become the world’s first climate trade war. The dispute placed the European Union against the United States and several other countries. At the center of the fight stood one difficult question: Who should pay for the carbon pollution created by international air travel?
The European Union had already taken an aggressive approach. It moved to include aviation within its carbon-emissions trading system. Essentially, airlines flying into or out of Europe could face costs tied to their carbon emissions.
However, other governments pushed back hard. The United States, China, India, Russia, and other nations objected to Europe imposing its climate policy on international airlines. Consequently, the disagreement moved beyond environmental policy. It became an issue involving national sovereignty, international commerce, airline competitiveness, and potentially trade retaliation.
That raised the stakes dramatically.
Nevertheless, the international agreement offered another path. Instead of allowing individual regions to build competing systems, participating nations moved toward addressing international aviation emissions through a broader global framework. Therefore, the agreement reduced immediate tensions while keeping aviation climate policy on the international agenda.
Why Aviation Emissions Matter
Aviation presents a particularly difficult climate problem because aircraft still depend heavily on energy-dense liquid fuels. Cars can increasingly switch to batteries. Buildings can move toward renewable electricity. However, replacing conventional jet fuel across long-distance commercial aviation remains much harder.
Meanwhile, global demand for air travel continues to grow. More passengers mean more flights. More flights generally mean more fuel consumption. Consequently, efficiency improvements alone may struggle to offset long-term growth in aviation demand.
Still, solutions continue to develop.
Airlines can operate newer and more efficient aircraft. Manufacturers can reduce weight and improve aerodynamics. Airports and air-traffic controllers can also improve routing and reduce unnecessary fuel consumption. Furthermore, sustainable aviation fuels could lower lifecycle greenhouse gas emissions when producers make them responsibly.
Eventually, electric and hydrogen-powered aircraft could also serve parts of the market. However, those technologies still face major challenges involving range, infrastructure, cost, weight, and scale.
Solutions
Therefore, aviation needs several solutions working together.
The international dispute also revealed something larger about climate policy. Carbon pollution does not respect national borders. Neither does aviation. As a result, governments must find ways to reduce emissions without creating a patchwork of conflicting regulations.
For now, international cooperation has prevented aviation emissions from becoming the center of a major climate trade war. However, the underlying challenge remains.
The world still wants to fly. Airlines still need energy. Yet the climate cannot absorb unlimited emissions.
Therefore, the real challenge is no longer whether aviation must become cleaner. It is how quickly governments, airlines, fuel producers, and aircraft manufacturers can make that transition happen.
Total Impact
Currently representing only about 5 percent or less of the global warming potential of human-caused emissions. Now aviation might seem like a tiny contributor to climate change. But if aviation were its own country, it would be the world’s seventh-largest carbon dioxide emitter, and without interventions, global aircraft emissions are on track to quadruple by 2050, says Annie Petsonk, international counsel and aviation expert at the Environmental Defense Fund.
Source: Ensia
WRITER
Christie Aschwanden
@cragcrest
2013/2014 Carter Fellow
