The indoor environment affects your health, here’s what you can do about it:

The indoor environment affects your health, here’s what you can do about it:

A snake plant, pictured above, is one of the many plants that can naturally filter your air.  Near the end of this article there’s a link to six other plants that are also great air filters.

Making an indoor environment healthy for human occupants is not as simple as it seems.   There are Continue reading

Spring Greening

Now that we are groggily emerging from our hibernation of sitting on the couch in a Snuggie and binge TV watching while eating cookie dough ice cream, it’s time to think about spring cleaning. On second thought, sweeping the garage, sorting old junk, and throwing mittens in a drawer sounds awful – let’s talk about spring greening instead! Here are a few tips for an energy efficient spring and summer: Continue reading

Do Unto Hazardous Waste Disposal as You Would Have Others Do Unto You – Talkin’ Trash, March 2017

The Mystery of Chemical & Pharmaceutical Waste

(apologies to mystery solvers everywhere)

Curiosity.

Aside from a few unlucky felines, it may very well be the defining characteristic of Homo sapiens, the distinguishing feature that sets us apart from most other living things on our fair planet.  It’s the instinctual drive to, like a toddler of the species Homo sapiens hopped up on multi-grain, GMO free, naturally sweetened “Os”, continually ask “Why? Why? Why?”…and later pose the perhaps more important query, “Why not?”

And we at UHN are fortunate to be surrounded by many who have become proficient at not only asking “why”, but then answering their own questions. And while I definitely do not put myself in the same league as these question askers and answerers, I do find myself pondering the occasional mystery from time to time…which, as of late, has had me coming back to the same question:  Why do things taste better when wrapped and in a tortilla?

Continue reading

Electric vehicles are coming – and that’s a good thing

Electric vehicles are coming – and that’s a good thing

 

Electric vehicles will have a positive environmental impact but that’s not always what you read. The point of this blog is to clear that up.

Renewables and electric vehicles (EVs) are shaking up long-established industries but there’s still a lot of misinformation spread around.  Online and even in our own Toronto papers I’ve seen some surprising… falsehoods about electrics.  From what I’ve seen most of it’s based on incorrect assumptions or outdated information.  For example did you know that since 2010 battery costs have fallen 80%, a full 7 years faster than expected?  Or that companies like Mercedes expect 25% of their sales to be electric by 2025?  Or that Tesla is targeting production of 500,000 electric vehicles in 2018?  There’s the Chevy Bolt EV out now, the Tesla Model 3 coming soon, and nearly all major manufacturers have now committed to producing long range EVs.  The future is rapidly approaching. (Pictured above: Longer range mass market electric vehicles – Telsa Model 3 and Chevy Bolt.  Images from Tesla and GM.)

 

So why is this a good thing?

Here are the facts:

 

1.Electric car batteries can, and are, being recycled.

There are articles that decry “electric car batteries are toxic sludge”, but those claims are unsubstantiated and unsupported.  Tesla has published a good deal of information about their batteries and recycling.  First, their batteries are RoHS1 compliant and fully recyclable.  RoHS refers to the restriction of hazardous substances directive for electrical and electronic equipment, adopted in 2003 by the EU.  Tesla also recycles their batteries 100% within Europe and at ~60% in the US, according to their blog.   Tesla is also building a recycling facility at their Gigafactory in Nevada.  Seems like there won’t be much toxic sludge to worry about.

 

2. Our electricity grid is actually pretty clean (from an emissions standpoint)

The myth “you’re using fossil fuels to power your electric car” is false.  Let’s look at where we live, with an Ontario electricity mix that includes no coal and only 10% from natural gas.  It’s mostly nuclear and hydro.  Canada on average is also looking good with 63% coming from hydro alone.  That’s a lot of carbon free power.

The USA average doesn’t look as good but it’s improving all the time (and we will see later that EVs are still the better choice).  There we see 33% of electricity from coal, 33% natural gas, 20% nuclear, 6% Hydro, and 7% from other renewables.  Still every year more coal plants are shut down and more renewables are being installed.  In 2015 7.5 GW of solar was installed in the US and in 2016 a total of 14.1 GW.

electricity-generation

3. Using electricity to power your car is more efficient than your gas or diesel

I recently read an article that said “burning a fossil fuel to power an electric car is nowhere near as efficient as burning that fuel to power the car directly”.   That’s simple not true but more importantly that’s not even a real scenario.  Just look at the electricity mix above, fossil fuels are only part of it.  Even in the US where fossil fuels use is much higher, natural gas is a cleaner, lower carbon option compared to gas, diesel, or coal.  Not all fossil fuels are equal.  So let’s use our real world information to avoid confusion with some mythical land filled only with big diesel generators.

There’s also the question of what efficiency we are using.  We want an apples to apples comparison so we need to be consistent with what’s included.  The total efficiency metric for vehicles is called “Well to Wheel” efficiency; it includes the efficiency from fuel extraction and transport, the engine, and finally the powertrain to the wheels.

Table: Vehicle Efficiency Comparison2vehicle-efficiency-comparisons

From the table we see that even with the current grid mix electric vehicle efficiency is double that of diesel and three times that of gasoline.  Efficiency is important but it’s not the same thing as ‘environmentally friendly’.  An engine that’s 100% efficient but runs on whale oil isn’t very friendly, at least not to whales.  The next section looks at the carbon intensity of the fuel sources.

 

4. Electric vehicles will reduce emissions -> by a lot in most cases

There seems to be a large amount of distrust for this, as if electric cars are some sort of scam to hoodwink unsuspecting millennials.  Let’s clear that up because it’s a big driver for EVs (pun there if you missed it).

  • The Union of Concerned Scientists did a full lifecycle emissions review3  and found the equivalent EV MPG in the US was about double that of combustion vehicles.
  • In Ontario my own analysis identified a 94% reduction in CO2 equivalent emissions from driving a Tesla Model S 85D compared to driving my gasoline powered VW Golf.  I also looked at the extra emissions from manufacturing the battery, which would be ‘paid back’ through driving emissions reductions by around 20,000 km.  Coincidentally that’s a Canadian’s average driving distance per year.  I’ve assumed 25% of the carbon is avoided/recaptured if the battery is recycled, in which case the payback occurs at ~15,000 km.

ev-emissions-reduction

Similarly, comparisons for the four most populated provinces in Canada, the Canadian average, and the US average all show significant reductions in the table below.

vehicle-emissions-comparison

 

5. Transport emissions are a big part of our national emissions

Some people have said that transport emissions aren’t significant and that they are only 12% of Canada’s greenhouse gas emissions.  That’s false but I think I know how they got there.  Environment Canada data shows transportation emissions are 23% of Canada’s total and roughly half of that is attributed to passenger vehicles.  That math works out to 12%, but that’s not the whole story.

That number excludes buses and freight truck transport, which would also see electrification or something equivalent.  With that included the total rises to ~20% of Canada’s total national greenhouse gas emissions.

But even that is not the whole story.  It leaves out how we got the fuel in the first place.

The oil and gas sector accounts for 26% of our total national emissions.  If we break out the emissions related to the oil processing for passenger vehicles, buses and freight trucks (i.e. the extraction, production, refining into gasoline or diesel, and transport of the fuel) the result is another 10%.

Adding the 20% for vehicles to the 10% for the oil and gas extraction brings us to a total of 30% of Canada’s total C02e emissions attributed solely to passenger vehicles, buses, and freight trucks.

Thirty Percent!  That’s a big deal.

 

6. Incentives will help make EVs more affordable for everyone, speeding up their adoption across the world

The purpose of incentives is to help a technology mature more quickly and as a result become economically viable for a much broader sector of the public.  Thus the benefits can be had for many more people much sooner than would otherwise be possible.   Governments also invest in the new technologies development through things like tax rebates or grants.  Incentives are one of the most democratic ways of advancing a technology; if people don’t want EVs, no government money goes to it.  If more electric vehicles can help balance our electricity demand between day and night then so much the better.

To decry the incentives on EVs while giving a pass to traditional automakers receiving hundreds of millions in factory rebates or conveniently forgetting the automotive industry bailout is cherry picking facts.

 

7. Right now there is no better option

I think it’s fair to say Dieselgate proved that clean diesel wasn’t what we thought.  There are also some people who say that hydrogen fuel cells are the future of transport and others say they always will be.   But EVs are here now and looking better every day.

To date the breakthroughs have been incremental, but they are compounding rapidly.  As EVs continue to grow in market share costs will continue to fall.  As power density improves the cars will go farther.  As DC charging expands and batteries charge faster, range anxiety will disappear.  As renewable energy continues to grow, total efficiency improves and electric vehicles will be even cleaner.  We are on the cusp of a paradigm shift in our transportation and energy sectors.  A shift that will help us reduce the effects of climate change, improve our air quality, and preserve our wonderful planet for future generations.

Oh and they cost a lot less to operate too.

 

 

 

 

 

 

———————————————————————

Notes and Reference Materials:

Originally this was just a letter to respond to a newspaper article but I was able to rework  it for this blog.  I spent more than just a few nights researching, using multiple sources to justify my assumptions and calculations.  I’ve made my best effort to present the data and  offer a realistic view of the environmental benefits.  I hope you’ve found it useful.

 

1 RoHS – https://en.wikipedia.org/wiki/Restriction_of_Hazardous_Substances_Directive

2 Vehicle Efficiency Comparison:

Vehicle Efficiency Calculation Notes

  • The results for combustion engines are taken from a 2010 MIT study.
  • “Tank to Wheel” efficiency for electric vehicle efficiency includes battery charge/discharge efficiency (~88%), motor (~93%), inverter (95%), and drivetrain transmission efficiency (~95%).
  • “Well to Wheel” efficiencies include the efficiency in producing the fuel. For electric vehicles we’ve used the grid electricity as the fuel, in Canada that has an efficiency of ~74% and in Ontario ~54%, with around 5% distribution losses.  Ontario is lower because nuclear reactors thermal efficiency of 33% (according to the US EIA, which also shows natural gas stations are 44% efficient).  To account for the extraction energy from the fuel I’ve reduced the EV efficiency by two percent.
  • Fuel cell vehicles suffer from an inefficient production of hydrogen, with nearly all coming from steam reformation of methane, and inefficient hydrogen to electricity conversion.

Vehicle Efficiency References

3 Union of Concerned Scientists Review http://www.ucsusa.org/clean-vehicles/electric-vehicles/life-cycle-ev-emissions#.WJylIVUrJEY

4 Battery CO2e:

 

5 Electricity Production Mix

 

6 Distribution Losses

 

7 Electricity CO2e/kWh

 

8 Battery Recycling

 

9 Carbon emissions from combustion vehicles

 

UHN: A Medical Innovator, But Also An Energy Innovator

My previous blog described a unique energy conservation project at UHN’s Princess Margaret Cancer Research Tower (PMCRT). With innovative contaminant sensing technology, we were able to convert our research lab exhaust system from constant flow to variable flow, which significantly decreased loading on the exhaust fan motors. As described in the blog, this change produced a reduction in electricity peak demand (kW) of 38.5% and reduction in overall annual electricity consumption (kWh) of 42.7%.

We thought this was a Continue reading

The Future’s Open Wide – Talkin’ Trash New Year 2017

(apologies to M. English)

It’s occurred to me, now that I’m severely entrenched in what can only be called my own personal middle-ages, that I seem to have amassed a body of experiences that have weathered the test of time and biology and, still to this day, resonate with me. In short, these are the moments that my brain has somehow decided are important to me and that I’ve hung on to over the years.

…It’s cresting Pulsatilla Pass, on the Sawback trail between Banff and Lake Louise, the just revealed view of the valley below making what seemed like hours of hiking upward disappear.

Continue reading

Show Me The (Waste Of) Money – Talkin’ Trash, October 2016

First A Contest

In celebration of Waste Reduction Week, which runs from October 17-23 this year, UHN has challenged the SickKids and Sinai Health Systems to an Interhospital Challenge – take the quick quiz before October 30 and help your hospital prove it’s a waste reduction champion.

And Now Back To Our Regularly Scheduled Blog

Money talks.  Sure, we don’t always listen to it, and sometimes even when we do pay attention, we don’t really understand what it’s saying…but undoubtedly, the murmur of money is all around us.

canadian_dollar_-_reverse

Continue reading