It was inevitable that climate change deniers and some oil industry promoters would misinterpret a study by scientist Andrew Weaver before reading beyond the headlines. A letter in the Calgary Herald actually claimed that “Weaver's revelation … raises even more skepticism about the entire science behind global warming.”
The writer went on to argue that the report by University of Victoria climate scientist Weaver and PhD student Neil Swart is an “awakening for David Suzuki and his environmental followers.”
It’s typical of the nonsense people who understand science have to put up with every day. The study, published in Nature, says the opposite.
Weaver and Swart set out to answer a simple question: “How much global warming would occur if we completely burned a variety of fossil fuel resources?” Their conclusion that burning all the coal or all the gas from the entire world’s resource bases would raise global average temperatures more than burning all the Alberta tar sands reserves is hardly a surprise.
What is surprising is their finding that emissions from burning all the economically viable oil from the tar sands would only contribute to a 0.03°C rise in world temperatures, and burning the entire tar sands oil in place would add 0.36° C. That may not seem like much, but we need to put it in context.
First, the study looked only at the emissions from burning the fuels and not from extracting, refining or transporting them. The report’s authors explain that these additional emissions “would come from the other resource pools and shouldn't be double-counted.”
If we are to avoid a 2° C increase in global temperatures, each person in the world would be allocated 80 tonnes of emissions over the next 50 years. The emissions from burning all the tar sands oil that is now economically viable (the reserves) would represent 64 tonnes of carbon for each of the 340 million people in the U.S. and Canada—about 75 percent of the U.S. and Canada’s global per capita allocation. If we include emissions from the extraction process, it rises to 90 percent or more.
The study doesn’t consider any other environmental consequences of the tar sands either, from water use and pollution to destruction of boreal habitat. In fact, a recently uncovered memo prepared for the federal government claims that damage from the tar sands may be irreversible and could pose a “significant environmental and financial risk to the province of Alberta.” The memo focused on rising emissions and damage from tailings ponds, among other effects. It concluded that “the cumulative impacts of oilsands development are not adequately understood.”
Our rush to get at the bitumen is also threatening wildlife and habitat. Conservation officers killed 145 black bears that got too close to the operations last year. And rather than protecting caribou habitat from destruction as extraction increases, the federal government has decided to kill wolves that prey on caribou instead.
On the political front, the European Union recently failed to pass its Fuel Quality Directive, which would have labelled tar sands oil as carbon intensive and undesirable for import, but that fight isn’t over.
As I’ve said before, we’re not going to stop using oil overnight, so we will continue to use tar sands products, at least in the short to medium term. But the best ways to limit environmental impacts are to slow down and to ensure the highest environmental standards are met and that we are getting maximum value for the oil to which all Canadians have a right.
As Weaver and Swart conclude: “If North American and international policymakers wish to limit global warming to less than 2° C they will clearly need to put in place measures that ensure a rapid transition of global energy systems to non-greenhouse-gas-emitting sources, while avoiding commitments to new infrastructure supporting dependence on fossil fuels.”
That doesn’t mean putting pipelines through pristine wilderness, extracting bitumen as quickly as possible, and shipping it off to China in supertankers. It does mean we have to find ways to stop using coal and gas as well as oil. As Weaver points out, “The tar sands are a symptom of a bigger problem. The bigger problem is our societal dependence on fossil fuels.”
Written with contributions from David Suzuki Foundation Editorial and Communications Specialist Ian Hanington.
Learn more at www.davidsuzuki.org.
EcoWatch Daily Newsletter
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The enduring pandemic will make conventional forms of travel difficult if not impossible this summer. As a result, many will consider virtual alternatives for their vacations, including one of the oldest forms of virtual reality – books.
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By Beth Ann Mayer
Since even moderate-intensity workouts offer a slew of benefits, walking is a good choice for people looking to stay healthy.
How to Rock Your Walk<p>Walking isn't just fun and healthy. It's accessible.</p><p>"Walking is cheap," says Dr. John Paul H. Rue, a sports medicine doctor at <a href="https://mdmercy.com/" target="_blank">Mercy Medical Center in Baltimore</a>. "You can do it anywhere at any time; [it] requires little to no special equipment and has many of the same cardio benefits as running or other more intense workouts."</p><p>Want to up your walking game? Try the tips below.</p>
Use Hand Weights<p>Cardio and strength training can go hand-in-hand when you add weights to your walk.</p><p>A <a href="https://journals.lww.com/acsm-msse/Fulltext/2019/03000/Associations_of_Resistance_Exercise_with.14.aspx" target="_blank">2019 study</a> found that weight training is good for your heart, and <a href="https://www.mayoclinicproceedings.org/article/S0025-6196(17)30167-2/abstract" target="_blank">research</a> shows it reduces the risk of developing a <a href="https://www.healthline.com/health/nutrition-metabolism-disorders" target="_blank">metabolic disorder</a> by 17 percent. People with metabolic disorders have a higher chance of being diagnosed with high cholesterol, high blood pressure, and diabetes.</p><p>Rue suggests not carrying weights for your entire walk.</p><p>"Hand weights can give you an added level of energy burning, but you have to be careful with these because carrying [them] over a long period of time or while walking could actually lead to some overuse injuries," he says.</p>
Make It a Circuit<p>As another option, consider doing a circuit. First, put a pair of dumbbells on your lawn or somewhere in your home. Walk around the block once, then stop and do some bicep curls and tricep lifts before walking around the block again.</p><p>Rue recommends <a href="https://www.healthline.com/health/exercise-fitness/running-with-weights" target="_blank">avoiding ankle weights</a> during cardio workouts, as they force you to use your quadriceps rather than hamstrings. They can also cause muscle imbalance, according to the <a href="https://www.health.harvard.edu/staying-healthy/wearable-weights-how-they-can-help-or-hurt" target="_blank">Harvard Health Letter</a>.</p>
Find a Fitness Trail<p>Strength training isn't limited to weights. You can get stronger by <a href="https://www.healthline.com/health/bodyweight-workout" target="_blank">simply using your body</a>.</p><p>Often found at parks, fitness trails are obstacle courses with equipment for pullups, pushups, rowing, and stretches to build upper and lower body strength.</p><p>Try searching "fitness trails near me" online, checking out your local parks and recreation website, or calling the municipal office to <a href="https://calisthenics-parks.com/" target="_blank">find one</a>.</p>
Recruit a Friend<p>People who workout together stay healthy together.</p><p><a href="https://bmcgeriatr.biomedcentral.com/articles/10.1186/s12877-017-0584-3" target="_blank">One study</a> showed that older adults who exercised with a group improved or maintained their functional health and enjoyed their lives more.</p><p>Enlist the help of a walking buddy with a regimen you aspire to have. If you don't know anyone in your area, apps like <a href="https://www.strava.com/" target="_blank">Strava</a> have social networking features so you can get support from fellow exercisers.</p>
Try Meditation<p>According to the <a href="https://www.nccih.nih.gov/research/statistics/nhis/2017" target="_blank">2017 National Health Interview Survey</a>, published by the National Institutes of Health, meditation is on the rise, and for good reason.</p><p>Researchers <a href="https://pubmed.ncbi.nlm.nih.gov/29616846/" target="_blank">found</a> that mind-body relaxation practices can regulate inflammation, <a href="https://www.healthline.com/health/biological-rhythms" target="_blank">circadian rhythms</a>, and <a href="https://www.healthline.com/health/glucose" target="_blank">glucose</a> metabolism, as well as lower <a href="https://www.healthline.com/health/high-blood-pressure-hypertension" target="_blank">blood pressure</a>.</p><p>"Any form of exercise can be turned into a meditation of some type, either by the surroundings you are walking in, like a park or trail, or by blocking out the outside world with music on your headphones," Rue says.</p><p>You can also play a podcast or download an app like <a href="https://www.headspace.com/headspace-meditation-app" target="_blank">Headspace</a> that has a library of guided meditations to practice while you walk.</p>
Do Fartlek Walks<p>Typically used in running, fartlek intervals alternate periods of increased and decreased speed. These are <a href="https://www.healthline.com/nutrition/benefits-of-hiit" target="_blank">high-intensity interval training (HIIT)</a> workouts, which allow exercisers to accomplish more in less time.</p><p><a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0154075" target="_blank">One study</a> showed that 10-minute interval training improved <a href="https://www.healthline.com/health/metabolic-syndrome" target="_blank">cardiometabolic</a> health, or lowered the risk of heart disease, stroke, and diabetes, just as well as working out at a continuous pace for 50 minutes.</p><p><a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0111489" target="_blank">Research</a> also shows that HIIT workouts increase muscle <a href="https://www.healthline.com/health/fast-twitch-muscles" target="_blank">oxidative</a> capacity, or the ability to use oxygen. To do a fartlek walk, try walking at an increased pace for 3 minutes, slow down for 2 minutes, and repeat.</p>
Gradually Increase Pace<p>A faster walking pace is associated with a lower risk of <a href="https://www.healthline.com/health/copd" target="_blank">chronic obstructive pulmonary disease (COPD)</a> and respiratory diseases, according to a <a href="https://pubmed.ncbi.nlm.nih.gov/30303933/" target="_blank">2019 study</a>.</p><p>Still, it's best not to go from a stroll to an Olympic-worthy power walk in a day. Instead, increase your pace gradually to prevent injury.</p><p>"Start by walking at a brisk pace for about 10 minutes per day, 3 to 5 days per week," Rue says. "Once you've done this for a few weeks, increase your time by 5 to 10 minutes per day until you get to 30 minutes."</p>
Add Stairs<p>You've likely heard that taking the stairs instead of an elevator is a way to add more movement into your daily routine. It's also a way to step up your walking. Stair climbing has been shown to <a href="https://www.sciencedirect.com/science/article/pii/S2211335519301123?via%3Dihub" target="_blank">decrease the risk of mortality</a> and can easily add a bit more challenge to your walk.</p><p>If you don't have stairs in your home, you can often find them outside a local municipal building, train station, or at a high school stadium.</p>
Is Your Walk a True Cardio Workout?<p>Not all walks are equal. A walk that's too leisurely may not provide enough burn to qualify as cardio. To see if you're getting a good workout, try to <a href="https://www.healthline.com/health/how-to-check-heart-rate" target="_blank">measure your heart rate</a> using a monitor.</p><p>"A target goal for a good walking workout heart rate is about 50 to 70 percent of your maximum heart rate," Rue says, adding that maximum heart rate is <a href="https://www.healthline.com/health/fitness-exercise/fat-burning-heart-rate" target="_blank">typically calculated</a> by 220 beats per minute minus your age.</p><p>You can also monitor how easily you can carry on a conversation while you walk to gauge your heart rate.</p><p>"If you can walk and carry on a normal conversation, that's probably a lower intensity walk," says Rue. "If you are slightly breathless but can still have a conversation, that's probably a moderate workout. If you are out of breath and can't talk normally, that's a vigorous workout."</p>
Takeaway<p>By shaking up your routine, you can add excitement to your workout and reap even more rewards than a basic walk provides. Increasing the pace and intensity of a workout will make it more effective.</p><p>Simply pick your favorite variation to add some spice to your next walk.</p>
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