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Environment

21 Liters of Water are Needed to Produce a Small Chocolate Bar: How Water-Wise is Your Diet?

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by Brad Ridoutt

(The Conversation) –Our diets can have a big environmental impact. The greenhouse gas emissions involved in producing and transporting various foods has been well researched, but have you ever thought about the water-scarcity impacts of producing your favorite foods? The answers may surprise you.

In research recently published in the journal, Nutrients, we looked at the water scarcity footprints of the diets of 9,341 adult Australians, involving more than 5,000 foods. We measured both the amount of water used to produce a food, and whether water was scarce or abundant at the location it was drawn from.

The food system accounts for around 70% of global freshwater use. This means a concerted effort to minimize the water used to produce our food – while ensuring our diets remained healthy – would have a big impact in Australia, the driest inhabited continent on Earth.

Biscuits, beer or beef: which takes the most water to produce?

We found the average Australian’s diet had a water-scarcity footprint of 362 litres per day. It was slightly lower for women and lower for adults over 71 years of age.

A water-scarcity footprint consists of two elements: the liters of water used, multiplied by a weighting depending on whether water scarcity at the source is higher or lower than the global average.

Foods with some of the highest water-scarcity footprints were almonds (3,448 litres/kg), dried apricots (3,363 litres/kg) and breakfast cereal made from puffed rice (1,464 litres/kg).

In contrast, foods with some of the smallest water-scarcity footprint included wholemeal bread (11.3 litres/kg), oats (23.4 litres/kg), and soaked chickpeas (5.9 litres/kg).

It may surprise you that of the 9,000 diets studied, 25% of the water scarcity footprint came from discretionary foods and beverages such as cakes, biscuits, sugar-sweetened drinks and alcohol. They included a glass of wine (41 litres), a single serve of potato crisps (23 litres), and a small bar of milk chocolate (21 litres).

These foods don’t only add to our waistlines, but also our water-scarcity footprint. Previous studies have also shown these foods contribute around 30% of dietary greenhouse gas emissions in Australia.

Sheep drink from a dried-up water storage canal between Pooncarie and Menindee in western NSW. Water shortages along the Murray Darling Basin have devastated ecosystems and communities. Dean Lewins/AAP

The second highest food group in terms of contributing to water-scarcity was fruit, at 19%. This includes whole fruit and fresh (not sugar-sweetened) juices. It should be remembered that fruit is an essential part of a healthy diet, and generally Australians need to consume more fruit to meet recommendations.

Dairy products and alternatives (including non-dairy beverages made from soy, rice and nuts) came in third and bread and cereals ranked fourth.

The consumption of red meat – beef and lamb – contributed only 3.7% of the total dietary water-scarcity footprint. These results suggest that eating fresh meat is less important to water scarcity than most other food groups, even cereals.

How to reduce water use in your diet

Not surprisingly, cutting out discretionary foods would be number one priority if you wanted to lower the water footprint of the food you eat, as well as the greenhouse gas emissions of production.

Over-consumption of discretionary foods is also closely linked to weight gain and obesity. Eating a variety of healthy foods, according to energy needs, is a helpful motto.

Aside from this, it is difficult to give recommendations that are relevant to consumers. We found that the variation in water-scarcity footprint of different foods within a food group was very high compared to the variation between food groups.

For example, a medium sized apple was found to contribute a water-scarcity footprint of three litres compared with more than 100 litres for a 250 ml glass of fresh orange juice. This reflects the relative use of irrigation water and the local water scarcity where these crops are grown. It also takes more fruit to produce juice than when fruit is consumed whole.

Two slices of wholegrain bread had a much lower water-scarcity footprint than a cup of cooked rice (0.9 litres compared with 124 litres). Of the main protein sources, lamb had the lowest water-scarcity footprint per serve (5.5 litres). Lambs are rarely raised on irrigated pastures and when crops are used for feeding, these are similarly rarely irrigated.

Consumers generally lack the information they would need to choose core foods with a lower water-scarcity footprint. Added to this, diversity is an important principle of good nutrition and dissuading consumption of particular core foods could have adverse consequences for health.

Workers process punnets of strawberries at a Queensland strawberry farm. Dan Peled/AAP

Perhaps the best opportunities to reduce water scarcity impacts in the Australian food system lie in food production. There is often very large variation between producers in water scarcity footprint of the same farm commodity.

For example, a study of the water scarcity footprint of tomatoes grown for the Sydney market reported results ranging from 5.0 to 52.8 litres per kg. Variation in the water-scarcity footprint of milk produced in Victoria was reported to range from 0.7 to 262 litres. This mainly reflects differences in farming methods, with variation in the use of irrigation and also the local water scarcity level.

Water-scarcity footprint reductions could best be achieved through technological change, product reformulation and procurement strategies in agriculture and food industries.

Not all water is equal

This is the first study of its kind to report the water-scarcity footprint for a large number of individual self-selected diets.

This was no small task, given that 5,645 individual foods were identified. Many were processed foods which needed to be separated into their component ingredients.

It’s hard to say how these results compare to other countries as the same analysis has not been done elsewhere. The study did show a large variation in water-scarcity footprints within Australian diets, reflecting the diversity of our eating habits.

Water scarcity is just one important environmental aspects of food production and consumption. While we don’t suggest that dietary guidelines be amended based on water scarcity footprints, we hope this research will support more sustainable production and consumption of food.

The author originally disclosed that he undertakes research for Meat and Livestock Australia. His disclosure has been updated to specify that the above research is among the projects to which the MLA has contributed funding.

The Conversation publishes knowledge-based journalism that is responsible, ethical and supported by evidence from academics and researchers in order to inform public debate with facts, clarity and insight into society’s biggest problems.

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Environment

Changes Brought On by Coronavirus May Help Tackle Climate Change

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Photo by DESIGNECOLOGIST

by Glen Peters for The Conversation

Stock markets around the world had some of their worst performance in decades this past week, well surpassing that of the global financial crisis in 2008. Restrictions in the free movement of people is disrupting economic activity across the world as measures to control the coronavirus roll out.

There is a strong link between economic activity and global carbon dioxide emissions, due to the dominance of fossil fuel sources of energy. This coupling suggests we might be in for an unexpected surprise due to the coronavirus pandemic: a slowdown of carbon dioxide emissions due to reduced energy consumption.

Based on new projections for economic growth in 2020, we suggest the impact of the coronavirus might significantly curb global emissions.

The effect is likely to be less pronounced than during the global financial crisis (GFC). And emissions declines in response to past economic crises suggest a rapid recovery of emissions when the pandemic is over.

But prudent spending of economic stimulus measures, and a permanent adoption of new work behaviours, could influence how emissions evolve in future.

Global fossil CO2 emissions (vertical axis) have grown together with economic activity (horizontal axis) over extended periods of time. Glen Peters/CICERO

The world in crisis

In just a few short months, millions of people have been put into quarantine and regions locked down to reduce the spread of the coronavirus. Around the world events are being cancelled and travel plans dropped. A growing number of universities, schools and workplaces have closed and some workers are choosing to work from home if they can.

Even the Intergovernmental Panel on Climate Change has cancelled a critically important meeting and will instead hold it virtually.

The International Energy Agency had already predicted oil use would drop in 2020, and this was before an oil price war emerged between Saudi Arabia and Russia.

The unprecedented coronavirus lockdown in China led to an estimated 25% reduction in energy use and emissions over a two-week period compared to previous years (mostly due to a drop in electricity use, industrial production and transport). This is enough to shave one percentage point growth off China’s emissions in 2020. Reductions are also being observed in Italy, and are likely to spread across Europe as lockdowns become more widespread.

The emission-intensive airline industry, covering 2.6% of global carbon dioxide emissions (both national and international), is in freefall. It may take months, if not years, for people to return to air travel given that coronavirus may linger for several seasons.

Given these economic upheavals, it is becoming increasingly likely that global carbon dioxide emissions will drop in 2020.

Global air travel is down significantly as a result of the pandemic. Andy Rain/EPA

Coronavirus is not the GFC

Leading authorities have revised down economic forecasts as a result of the pandemic, but so far forecasts still indicate the global economy will grow in 2020. For example, the Organisation for Economic Cooperation and Development (OECD) downgraded estimates of global growth in 2020 from 3% (made in November 2019) to 2.4% (made in March 2020). The International Monetary Fund has indicated similar declines, with an update due next month.

Assuming the carbon efficiency of the global economy improves in line with the 10-year average of 2.5% per year, the OECD’s post-coronavirus growth projection implies carbon dioxide emissions may decline 0.3% in 2020 (including a leap year adjustment).

But the GFC experience indicates that the carbon efficiency of the global economy may improve much more slowly during a crisis. If this happens in 2020 because of the coronavirus, carbon dioxide emissions still could grow.

A decomposition of CO2 emissions growth into economic growth (orange) and carbon efficiency improvements (green) to estimate future emissions based on OECD economic growth projections. Glen Peters/CICERO

Under the worst-case OECD forecast the global economy in 2020 could grow as little as 1.5%. All else equal, we calculate this would lead to a 1.2% decline in carbon dioxide emissions in 2020.

This drop is comparable to the GFC, which in 2009 led to a 0.1% drop in global GDP and a 1.2% drop in emissions. So far, neither the OECD or International Monetary Fund have suggested coronavirus will take global GDP into the red.

The emissions rebound

The GFC prompted big, swift stimulus packages from governments around the world, leading to a 5.1% rebound in global emissions in 2010, well above the long-term average.

Previous financial shocks, such as the collapse of the former Soviet Union or the 1970s and 1980s oil crises, also had periods with lower or negative growth, but growth soon returned. At best, a financial crisis delays emissions growth a few years. Structural changes may happen, such as the shift to nuclear energy after the oil crises, but evidence suggests emissions continue to grow.

Global fossil CO2 emissions (in Gigatons or billions of tonnes of CO2) and carbon intensity of world Gross Domestic Product (grams of CO2 per $US, 2000), with the most important financial crises. Global Carbon Project

The economic legacy of the coronavirus might also be very different to the GFC. It looks more like a slow burner, with a drop in productivity over an extended period rather than widespread job losses in the short term.

Looking to the future

The coronavirus pandemic will not turn around the long-term upward trend in global emissions. But governments around the world are announcing economic stimulus measures, and they way they’re spent may affect how emissions evolve in future.

There is an opportunity to invest the stimulus money in structural changes leading to reduced emissions after economic growth returns, such as further development of clean technologies.

Fewer people are expected to use public transport during the coronavirus outbreak. Steven Saphore/AAP

Also, the coronavirus has forced new working-from-home habits that limit commuting, and a broader adoption of online meetings to reduce the need for long-haul business flights. This raises the prospect of long-term emissions reductions should these new work behaviours persist beyond the current global emergency.

The coronavirus is, of course, an international crisis, and a personal tragedy for those who have lost, and will lose, loved ones. But with good planning, 2020 could be the year that global emissions peak (though the same was said after the GFC).

That said, past economic shocks might not be a great analogue for the coronavirus pandemic, which is unprecedented in modern human history and has a long way to go.


Glen Peters is Research Director, Center for International Climate and Environment Research – Oslo.

The Conversation publishes knowledge-based journalism that is responsible, ethical and supported by evidence from academics and researchers in order to inform public debate with facts, clarity and insight into society’s biggest problems.

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Community

WeHo Annual Arbor Day Celebration Plummer Park – Mar 21

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WEST HOLLYWOOD — The City of West Hollywood invites community members to join staff and City Councilmembers for a tree planting ceremony in Plummer Park as part of the annual Arbor Day celebration.

Arbor Day is a special day that is set aside throughout the world to raise awareness of trees and the important role that they play in our environment.

People throughout the world take part in tree planting events and other celebrations of trees and the role that they play in our environment.

The first American Arbor Day was originated in Nebraska City, Nebraska by J. Sterling Morton. On April 10, 1872, an estimated one million trees were planted in Nebraska.

Saturday, March 21, 2020 at 9 a.m. at the Parkway on N. Vista Street on the West Side of Plummer Park, located at 7377 Santa Monica Boulevard.

For more information, please contact Debbie Gonzalez at (323) 848-3116 or dgonzalez@weho.org.

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Environment

House Passes Schiff’s Rim of the Valley Corridor Preservation Act

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WASHINGTON D.C. – Rep. Adam Schiff has applauded the bipartisan passage of The Rim of the Valley Corridor Preservation Act, which would add more than 191,000 acres of the Rim of the Valley Corridor to the Santa Monica Mountains National Recreation Area (SMMNRA). The bill passed the House on a bipartisan basis with 231 Yeas and 183 Nays

Schiff first introduced this legislation in 2017, and Senators Dianne Feinstein and Kamala Harris introduced companion legislation in the Senate. It recently passed out of the Senate Energy and Natural Resources Committee on a bipartisan basis.

To view a map of the proposed expansion under the Rim of the Valley Corridor Preservation Act, click here

“I am thrilled that the House of Representatives has passed the Rim of the Valley Corridor Preservation Act, legislation I have championed for nearly 20 years,” Congressman Schiff said. “Preservation of the open space in our communities is not only good for our environment, wildlife, and ecosystems, but it is beneficial for the health and well-being of residents of all ages. The Rim of the Valley corridor is an area of striking and breathtaking natural beauty, and we must do whatever we can to preserve that beauty for the benefit of LA residents, the millions each year who visit, and for generations to come.”

“Today’s vote in the House is a win for the Rim of the Valley Corridor and the millions of Los Angeles County residents living in the surrounding communities,” said Senator Feinstein. “Preserving this unspoiled terrain will protect sensitive habitat for California wildlife and open space to benefit local economies. I am glad that Congressman Schiff was able to pass it in the House and look forward to doing the same here in the Senate, where it has already advanced out of committee.”

“The Rim of the Valley corridor is home to some of Southern California’s most beautiful wildlife and landscapes,” said Senator Harris. “That is why we must take immediate steps to protect this area’s habitats and natural resources. I am grateful to Congressman Schiff for his leadership on this issue and I applaud the House of Representatives for prioritizing the preservation of this area so it can be enjoyed by future generations. I look forward to working with my colleagues in the Senate to get this bill across the finish line.”

The proposed expansion is based on a six-year study of the region completed by the National Park Service in 2015. This legislation would expand the SMMNRA to include many, but not all, of the land included in the study. The lands included within the expansion will be known as the Rim of the Valley Unit and stretches from the Simi Hills and Santa Susanas to the Verdugos and on to the San Gabriel Mountains. The bill will enable NPS and the local community to better protect natural resources and habitats, and provide members of the community with improved access to nature for recreational and educational purposes.

To view the fact sheet about the legislation, click here.

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