Over the last two months I've read dozens of studies about gas stoves and indoor air quality.

I also installed monitors in our home and ran my own tests.

Here's a thread on what I learned 🧵 #energytwitter
First, I should admit that I was skeptical about the panic over gas stoves at first.

As a climate hawk, I was focused on the emissions.

Gas stoves are responsible for 0.12% of emissions in America. I felt like we should focus on the bigger stuff (furnaces and water heaters).
But then I learned about the negative health impacts of gas stoves.

Researchers have been studying this stuff for decades. And every year, it becomes more clear:

Gas stoves produce unsafe levels of nitrogen dioxide (NO2). And that causes respiratory illnesses like asthma.
In Sept, @WHO released their latest guidelines on indoor air pollution.

They recommended no building should have higher than 5.3ppb of NO2 on average throughout the year.

So I set up air quality monitors in my house to see if we passed the test.
Here's a chart showing the average level of NO2 throughout December.

The dotted line is the daily average. The top line is the peak concentration.

Our daily average hovered around 2x the WHO guidelines. Image
Can you guess which day we went out of the town and didn't use our gas stove, furnace or water heater?

Yup, it was the day that NO2 levels plummeted.
Here's what happened every night when we used our stove or oven.

291ppb of peak concentration is... not good.

And that's what it looked like whenever we made dinner.

The only exception: the nights we got takeout and didn't use the gas stove. Image
I asked @jlashk, an environmental epidemiologist to take a look at the data.

He said, "I would say you've got a pretty big NO2 problem."

Not exactly what you want to hear from someone who studies this stuff for a living.
NO2 is especially bad for children.

The first meta-analysis on this topic was published in 1992.

It found that for every 16ppb increase in NO2 levels — comparable to the increase resulting from exposure to a gas stove — the odds of respiratory illness in children go up by 20%.
In 2013 another meta-analysis on the topic came out.

This time the authors concluded, “Children living in a home with gas cooking have a 42% increased risk of having current asthma.”
And think about that for a second.

We've known that gas stoves cause asthma and other respiratory illnesses for 30 years.

Yet, in that same period millions of homes have been built with gas hookups.
The fact that we still allow these things in new construction is crazy.

Most building codes have nothing to say about gas appliances or NO2.

This is a failure of the @EPA and most state and city governments in America.
Like I said, I was skeptical about all this at first. But in study after study that I read, the data showed the same thing.

Gas stoves aren't safe.
You can read more about what I learned and find links to all the sources of data here - carbonswitch.co/how-bad-is-my-…
Shoutout to @jlashk for his research on this topic and helping me make sense of my indoor air quality data.

Thanks to @MothersOutFront @RockyMtnInst and @SierraClub for their advocacy on this issue.

And thanks to @drvolts @rebleber @jeffbradynews for their reporting on this.
Update: lots of people asking about ventilation.

Unfortunately range hoods don't reduce NO2 (see peer-reviewed research below).

In other words, for the context of this research it was irrelevant.

More here -

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More from @curious_founder

Jan 17
Wow, ~150,000 people read this thread on gas stoves.

Thousands of people said they had no idea. Many said they'd never buy a gas stove again.

Lesson learned: People care a lot more about their health than cutting carbon or saving energy.

For those working to #electrifyeverything this is so important.

Personally, I get caught up writing for and to the #energytwitter crowd too much.

Peak load this. Carbon intensity that.

The reality is that most people don't care about this stuff.
In home electrification, people care about:

- The health and safety of their family
- The comfort of their home
- A whole lot of other things...
- Saving some money on their utility bill
- More things
- And then cutting their carbon footprint.
Read 4 tweets
Jan 14
Well that thread certainly took off.

Lots of questions about ventilation, what monitor I used, and what you should do if you have a gas stove.

So here's... another thread 🧵

First, let's talk ventilation (i.e. range hoods, fans, etc).

The most common question I got was: "If I use my range hood am I safe?"

Yes and no.
All cooking -- whether you use gas or electric -- produces PM2.5 pollution.

Basically when you cook food, little particles that are smaller than a human hair start flying around your kitchen.

That stuff isn't good to breathe.
Read 16 tweets
Dec 23, 2021
3 years ago I started my company, Campfire Labs, and pledged 50% of the profits to climate advocacy.

Today I just sent ~$200,000 worth of grants bringing our total giving for the year to ~$300,000.


Here are some of the orgs we gave money to this year 🧵
.@theclimatevote for grassroots climate organizing and making effective climate action easy.

Here's a thread on why I love what they're doing:
.@rewiringamerica for developing and lobbying for federal policy to #electrifyeverything

@GriffithSaul and the Rewiring team have brought a ton of people into the climate movement by creating a new story that is more motivating than the old sacrifice narrative.
Read 8 tweets
Nov 30, 2021
I analyzed ~65,000 nonprofit tax returns to see where charitable dollars go in America.

I learned that environmental nonprofits receive less than 2% of all donations.

Here's what else I learned 🧵

#GivingTuesday #energytwitter
In 2020 Americans gave $471 billion to nonprofits.

Most of those donations went to the following categories: religion, education, human services, and health.

Environmental organizations received just $8 billion (~2%) — the least amount of any category tracked by the IRS. Image
Organizations working to reduce GHG emissions received only $2 billion.

That means 0.4% of all charitable donations went to climate mitigation.

Which is a huge bummer to say the least.
Read 11 tweets
Nov 12, 2021
Most banks use your money to fund fossil fuel projects 👎

But some banks use your money to fund #climate solutions like solar ☀️

I spent dozens of hours over the last few weeks trying to find the best climate-friendly bank.

Here's what I learned 🧵
1. Most banks are still pouring trillions into fossil fuel projects.

Here's how much the top banks have lent since Paris:

@Chase: $316 billion
@Citi: $237 billion
@WellsFargo: $223 billion
@BankofAmerica: $198 billion

Source: @RAN's latest report - ran.org/wp-content/upl…
2. Where you choose to bank has a direct impact on what projects do or don't get funded.

If you bank with @Chase or @WellsFargo, your money funds more oil rigs and coal plants.

If you switch to a sustainable bank, your money funds rooftop solar, wind farms, EVs, etc.
Read 9 tweets
Nov 12, 2021
AHRI just released the latest data on heating and cooling installs.

353k homeowners installed natural gas furnaces in Sept.

Those installs guarantee ~4m tons of carbon emissions / year for the next 20 years.

That's 80m of carbon budget 🔥 in a single month.

We need to get that number to zero ASAP. But we're trending in the wrong direction.

Here are the gas furnace install numbers for the last three Septembers:

2019: 286,870
2020: 351,087 (weird year)
2021: 353,047

Here they are for the last 2 decades (note: 2021 YTD is up 30%)
Now let's look at air conditioning units ❄️

All a/c runs on electricity. That's good. But most a/c units are really inefficient. That's bad.

So in the short term, installing inefficient units is its own form of fossil-fuel lock-in.
Read 9 tweets

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