We Can’t Stop Global Warming Without Reducing Driving

Electric vehicles aren't going to cut it, emissions-wise. That's one alarming finding in a new report from Intergovernmental Panel on Climate Change.

The estimates vary. But one important finding estimates [PDF, page 65] that about 20 percent of emission reductions needed to limit temperature rise need to come from trips avoided or trips shifted — from cars to trains, buses and bikes.

Meredith Hankins, an environmental law fellow at UCLA notes in an article for Legal Planet that this has been soft-pedaled in discussions about decarbonizing the transportation sector.

But as transport emissions make up a greater and greater portion of overall emissions, it's time we started discussing our strategy for reducing driving miles more seriously and openly, she says.

There still aren't very many public agencies that have made reducing vehicle miles traveled a policy priority. Minneapolis deserves especial credit for its newest comprehensive plan, which proposes an 80 percent reduction in transport emissions by 2050. In order to meet that goal, the city estimates it needs to reduce driving miles by 40 percent. The city has proposed reducing the number of parking spaces required, increasing the walkability of neighborhoods by allowing more dense housing and even banning new gas stations within city limits in service of that goal.

At the state level, California has been perhaps the boldest with policies aimed at limiting driving miles -- however so far they have not had much success. Driving miles have escalated in recent years. Here's what the California Air Resources Board has proposed:

• Quadrupling the number of trips made by walking
• Limiting urban growth boundaries
• Instituting congestion pricing, parking pricing
• Prioritizing transit, walking and biking projects for state infrastructure funding

Patrick Sisson at Curbed pointed out recently that some studies have estimated that large global cities could cut their emissions by a third based on improvements in housing density alone.

We have to start talking about these solutions and making them part of mainstream environmental policy, Hankins says. Time is running out.

"We can’t afford to ignore significant climate mitigation measures just because they are politically difficult," she writes.