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Global Warming |
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Air Transport and Global Warming
Aircraft engines use fossil fuels, and when burning, these fuels generate carbon dioxide (CO ). This accounts for the majority of greenhouse gases, which are believed to be the cause of global warming. The amount of CO emitted by commercial aircraft in Japan is estimated to be approximately 0.9% of total domestic CO emissions, and 2%–3% of worldwide totals.
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CO Emissions for Japan (fiscal 2003) |
Reducing Aircraft Fuel Consumption
The amount of CO emitted by aircraft is approximately proportional to the amount of fuel consumed. The JAL Group is targeting fuel-consumption cuts of 20% per transported ton by 2010 compared with 1990 levels. In line with this, we are making various efforts towards reducing fuel consumption, such as the following measures: |
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Measures |
| Company-wide |
Phasing in fuel-efficient aircraft, decommissioning older aircraft |
| Flight operations |
Improved cruise-performance monitoring system adopted in all aircraft in fiscal 1994
Selection of optimal flight altitude, speed, route
Auto-landing under low-visibility conditions
Selection of shorter domestic routes, using area navigation
Operation of Communications, Navigation, Surveillance/Air Traffic Management (CNS/ATM)
Optimizing aircraft center of gravity to reduce wind drag
Use of flight simulators in flight-crew training and testing
GPU use with aircraft parked at airports
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| Other divisions |
Reducing volume and weight of cabin-service goods
Local purchase of cabin-service goods and cargo fittings
Efficient engine testing in aircraft maintenance
Determining optimum fuel load in flight planning
Direct inbound cargo flights from Europe using 747-400Fs
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One of the important features of this working group is to promote awareness activities by hosting monthly meetings. In those meetings, we discuss ideas to reduce CO emissions that can be effected by the pilot. For example, when the aircraft is on the ground, the APU provides air-conditioning and electricity, but we can reduce CO emissions by cutting the usage time. We can also reduce CO emissions by altering altitude and speed during the flight. Of course, ensuring safety is our top priority, and passenger comfort is also important, so it is not always possible to give precedence to CO reduction. The working group provides ideas to meet particular conditions that occur during flight so that crews can make their flights more eco-friendly, while taking into account such factors as weather, punctuality and passenger comfort. |
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Hideki Kudo
747-400 captain, Global Environmental
Working Group leader
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Aircraft CO Emissions
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Changes in Aircraft CO Emissions
The graph below shows changes in estimated emissions per
available ton-kilometer (ATK) emitted by commercial operation of JAL Group aircraft. The total CO emissions in fiscal 2005 were 16,875,000 metric tons, down 0.8% from the previous fiscal year. |
CO Emissions per ATK |
NB: For aircraft operated by JAL, Japan Asia Airways (JAA), JALways, Japan TransOcean Air (JTA), JAL EXPRESS (JEX), J-AIR, Ryukyu Air Commuter (RAC), Japan Air Commuter (JAC) and Hokkaido Air System (HAC)
ATK is calculated by using the great-circle distance. |
CO Emissions per ATK for Freighters |
g CO /ton-km |
| Aircraft |
Fisal 2003 |
Fisal 2004 |
Fisal 2005 |
| 747F, 747-400F |
550 |
537 |
520 |
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ATK Percentage of Five Low-CO -Emission Aircraft |
Fiscal 2005 performance: 65.6%
Fiscal 2010 target: >75.0%
We aim to increase the ATK percentage of these five low-CO -emission aircraft. |
| Domestic JAL Energy Saving |
The annual consumption of electricity, thermal energy and water in the domestic operational bases of JAL for the last five years is shown in the following charts. Total consumption at domestic offices in fiscal 2005 was as follows:
| Electricity: |
222 million kWh (2.4% decrease from previous year) |
Thermal energy
(converted into crude oil): |
16,809 kiloliters (4.9% decrease from previous year) |
| Total electricity and thermal energy: |
2.83 billion MJ (3.0% decrease from previous year) |
| Water: |
705,000 cubic meters (1.5% increase from previous year) |
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| Thermal Energy Consumption |
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