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Self-Driving Cars Could Cause More Pollution – Unless Electric Grid Transforms Radically

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By Peter Fox-Penner, Jennifer Hatch and Will Gorman

The world is on the cusp of dramatic changes in the ways people own, operate and power their means of transportation.


Known as the "three revolutions," a term coined by UC Davis transportation professor Daniel Sperling, the new trends are: electric vehicles, autonomous vehicles and sharing-oriented business models (think Uber and Lyft). Optimistically, these revolutions could make our cities a dreamscape of walkable urbanism that will reduce accidents to near zero and make more space for bikes, trees, pedestrians and small businesses while emitting no carbon emissions.

However, because these new technologies aim to dramatically reduce transportation costs, many people are concerned that more people will use autos to get around and the future will be filled with worse traffic and congestion. That could mean that consumption of fossil fuels will increase – bad outcomes for society's sustainability goals.

We've analyzed a whole body of literature on autonomous vehicles and found that autonomous vehicles in particular will likely greatly increase overall transportation demand: With more options available, more people will take advantage of these autonomous vehicles and ride services. Whether there is a net increase or decrease in pollution from higher energy consumption, however, is less obvious.

The key factors affecting carbon emissions from these emerging transportation trends are whether vehicles are electric or use conventional internal combustion engine technology, and how quickly the electric grid can "decarbonize," or generate power with no net carbon emissions.

Powering Autos With the Electric Grid

Since 2016, transportation has been the single largest source of greenhouse gas emissions in the U.S. As our electricity mix becomes less carbon-intensive and transportation demand grows, transportation will make up an increasing proportion of our carbon emissions if the U.S. continues to depend upon a system fueled by internal combustion engines and gasoline.

But how does our country realistically plan for a system that both meets the energy demands of our future transportation system and reduces our carbon emissions?

Our recent paper aimed to answer these questions. Our goal was first to incorporate the big but often overlooked trends in transportation to forecast how much transportation demand will grow. Second, we sought to create reasonable estimates for what is required to enable a clean, renewable and dependable electricity system in the years to come.

We reviewed both academic and industry research regarding future personal vehicle sales, energy efficiency improvements and total vehicle miles traveled as more people use autonomous vehicles.

These charts show the impact on emissions from a rapid shift to a less-polluting grid (left) or a more gradual transition based on government forecasts. In both cases, the key to lower emissions is whether light duty vehicles shift to electric and how clean the power grid is. Peter Fox-Penner / Will Gorman / Jennifer Hatch

This research allowed us to build a model that projects the number of electric and autonomous vehicles that could be on U.S. roads in the future and their related energy and emissions.

Our study estimates that by 2050 the net increase in electricity demand from converting the light duty vehicle fleet to electric, autonomous vehicles will be between 13 percent and 26 percent more than today's total electricity demand. In the best case, where 95 percent of the electric sector decarbonizes by that time, this scenario would result in a reduction in greenhouse gas emissions of up to 80 percent from 2015 light duty vehicle greenhouse gas emissions.

Drilling Down

A few interesting implications follow from of our greenhouse gas emission results. The first is that the rise in ride-hailing services and autonomy—assuming it is 100 percent electric—doesn't drive significant increases in carbon emissions.

In our "stress case," we assumed dramatic increases in vehicle miles traveled (VMT) due to autonomous vehicles, slow improvements in vehicle energy efficiency and limited transportation redesign. In this scenario, there was virtually no difference in greenhouse gas emissions compared to other cases with more conscientious policy planning, including VMT taxes, increased public transportation and other measures.

This counterintuitive outcome might make a little more sense by diving into the results. In comparing different scenarios, we found that emissions are more than twice as high in a "low EV" scenario of 50 percent EVs in the fleet by 2050, compared to a "high EV" scenario of 86 percent EVs in the fleet by 2050.

This reflects how much more the shift in electric vehicles affects transportation pollution relative to other major trends in transportation. Even if there are more miles driven from autonomous vehicles, if they are electric and the grid becomes increasingly cleaner, then emissions won't rise dramatically compared to the country's current course.

Another takeaway that follows from this result is that society can only achieve dramatic cuts in greenhouse gas emissions by making the electric grid dramatically less polluting.

Optimistic Scenario

Our study describes what is possible by 2050, and more or less what we believe we need to do in order to ensure the shift to autonomous vehicles and widespread ride-hailing services doesn't lead to big spikes in pollution.

Of course, transitioning the grid to 95 percent to 100 percent clean energy won't be easy; currently only 37 percent is from wind, solar, hydropower and nuclear. Nor will ensuring that almost all of our light duty vehicles are electric. That's partly because EVs are not yet cost-competitive with internal combustion engine vehicles. Also, there are a number of infrastructure challenges to updating the grid for a major shift to electric transportation.

A massive conversion to electric vehicles and low-emissions power generation are needed to slow and lower rising pollution from transportation. Portland General Electric / CC BY-ND

The good news for utilities is that the increase in electricity demand from electric vehicles will provide a positive, but not overwhelming amount of growth for electric utilities—growth that is welcome given the stagnant or declining revenues for electric utilities the last decade. This should come as a welcome opportunity and could create a strong ally as EV ownership grows.

Though our results represent time frames far out into the future, the policies that will lead us there are being written today. Our study suggests that in the near term, rapid and complete transport electrification and a carbon-free grid should remain the cornerstones of transport decarbonization policy. However, long-term policy should also aim to ensure AVs are electric and mitigate autonomous vehicles' potential to increase driving mileage, urban and suburban sprawl, and traffic congestion.

And policymakers should not delay. The rise of Uber and Lyft have already dramatically upended business models that have existed for decades, and autonomous vehicle technology, which still has a few years to go before replacing human drivers, is already impacting cities around the country. The question now is whether these trends will reduce or increase our country's emissions.

Reposted with permission from our media associate The Conversation.

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Farms with just one or a handful of different crops encourage fewer species of pollinating and pest-controlling insects to linger, ultimately winnowing away crop yields, according to a new study.

Up to half of the detrimental impacts of the "landscape simplification" that monocropping entails come as a result of a diminished mix of ecosystem service-providing insects, a team of scientists reported Oct. 16 in the journal Science Advances.

Monocrop palm oil plantation Honduras.

SHARE Foundation / Flickr / CC BY-NC 2.0​

"Our study shows that biodiversity is essential to ensure the provision of ecosystem services and to maintain a high and stable agricultural production," Matteo Dainese, the study's lead author and a biologist at Eurac Research in Bolzano, Italy, said in a statement.

It stands to reason that, with declines in the sheer numbers of insects that ferry pollen from plant to plant and keep crop-eating pests under control, these services will wane as well. But until now, it hasn't been clear how monocultures affect the number and mix of these species or how crop yields might change as a result.

Aiming to solve these questions, Dainese and his colleagues pulled together data from 89 studies cutting across a variety of landscapes, from the tropics of Asia and Africa to the higher latitudes of northern Europe. They tabulated the number of pollinating and pest-controlling insects at these sites — both the absolute number of individuals and the number of species — along with an assessment of the ecosystem services the insects provided.

In almost all of the studies they looked at, the team found that a more diverse pool of these species translated into more pollination and greater pest control. They also showed that simplified landscapes supported fewer species of service-providing insects, which ultimately led to lower crop yields.

The researchers also looked at a third measure of the makeup of insect populations — what they called "evenness." In natural ecosystems, a handful of dominant species with many more individuals typically live alongside a higher number of rarer species. The team found as landscapes became less diverse, dominant species numbers dwindled and rare species gained ground. This resulting, more equitable mix led to less pollination (though it didn't end up affecting pest control).

"Our study provides strong empirical support for the potential benefits of new pathways to sustainable agriculture that aim to reconcile the protection of biodiversity and the production of food for increasing human populations," Ingolf Steffan-Dewenter, one of the study's authors and an animal ecologist at the University of Würzburg in Germany, said in the statement.

The scientists figure that the richness of pollinator species explains around a third of the harmful impacts of less diverse landscapes, while the richness of pest-controlling species accounts for about half of the same measure. In their view, the results of their research point to the need to protect biodiversity on and around crops in an uncertain future.

"Under future conditions with ongoing global change and more frequent extreme climate events, the value of farmland biodiversity ensuring resilience against environmental disturbances will become even more important," Steffan-Dewenter said.

Reposted with permission from our media associate Mongabay.

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