New Study Exposes Significant Climate Impact Of Long-Distance Travel
New research from the University of Leeds has revealed the significant climate impact of long-distance passenger travel. Although less than 3% of all trips by UK residents are over 50 miles, these journeys account for 70% of all passenger travel-related carbon emissions.
The disparity is even greater for international travel, which constitutes only 0.4% of total trips but is responsible for 55% of emissions. The study, published today in the journal Nature Energy, suggests that targeting long-distance travel could be a more effective way of tackling emissions than focusing on local and commuter journeys.
Over the past 25 years, the number of long and short distance domestic car journeys has slightly decreased, while international air travel has significantly increased due to leisure trips and visits to friends and family. Dr. Zia Wadud, who led the research, said that the scale of long-distance travel's impact is substantial and offers opportunities for combating climate change.
The research team created a new metric called emission reduction sensitivity to calculate which types of travel could be changed to maximize carbon emission reductions while affecting as few people or trips as possible.
They found that shifting all car journeys under eight miles to walking or cycling would result in a 9.3% reduction in carbon emissions, but around 55% of all journeys would need to be shifted since most travel is done locally and in cars.
In contrast, moving all flights under 1,000 miles to rail would lead to a 5.6% reduction in emissions but only affect 0.17% of journeys. Limiting everyone who flies now to one return flight abroad per year would have an even greater impact. The researchers emphasize that these potential changes are meant to make people reassess their long-distance travel's impact rather than serve as concrete policy proposals.
Dr. Muhammad Adeel added that while efforts to shift local journeys to more sustainable modes of transport are positive, omitting aviation emissions from national statistics means we are not getting a holistic picture and ignoring a large part of the problem.
The researchers hope their findings will encourage policymakers to consider changes in how effort is assigned when dealing with the impact of travel on the environment.
The data was collected from the Department for Transport's National Travel Survey and the International Passenger Survey organized by the Office for National Statistics. The research also provides insight into how changing individual behavior could help reduce emissions.
Dr. Wadud concluded that prioritizing relatively fewer longer distance trips—especially flights—could lead to significant reductions at both policy and personal levels.
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