Every once in a while, someone finds out I work in sustainability and asks me a version of the same question:
“Okay, but what actually matters?”
And honestly, I get it.
There is so much sustainability advice out there, and a lot of it can feel noisy, guilt-heavy, or focused on the tiniest things. Bring your reusable straw. Buy the “green” version. Recycle perfectly, or the planet is doomed. Somewhere along the way, sustainability started to feel like a checklist of small habits instead of a conversation about what really drives impact.
So when someone asks me what actually makes a difference, I usually come back to the same three things: what we eat, how we get around, and how much we consume.
Not because those are the trendiest sustainability topics, but because they consistently show up as some of the biggest areas of personal environmental impact.
The First is Food.
What we eat matters more than most people realize, especially when it comes to how often we eat animal-based foods like beef and lamb. This is not about telling everyone they need to go vegan overnight. It is about understanding that some foods simply require more land, water, energy, and resources to produce than others. Choosing more plant-rich meals throughout the week can make a meaningful difference over time. It is one of those sustainability shifts that does not have to be all-or-nothing to matter.
The Second is Transportation.
For many people, especially in the United States, transportation makes up a major part of their environmental footprint. And while people often jump straight to asking about electric cars, I think the bigger question is usually this: how often are we driving, and do we need to be?
That does not mean everyone should bike to work or never get on a plane again. It simply means that reducing unnecessary trips, combining errands, carpooling, walking when possible, and flying less when we can are often more impactful than people think.
And yes, electric cars absolutely have a place in this conversation. If someone needs a car and is replacing one anyway, an electric vehicle can be a better option than a gas-powered one. But driving less is still more sustainable than simply switching what we drive. That nuance matters.
The Third is Consumption.
We do not always think about the environmental cost of the things we buy because we tend to focus on what happens after something is used. Can it be recycled? Can it be composted? Can it be thrown away “the right way”?
But sustainability also asks a question much earlier in the process: Did this need to be made at all?
Every product carries a footprint before it ever reaches our home. Materials have to be extracted. Items have to be manufactured, packaged, shipped, and eventually discarded. That means one of the most sustainable things we can do is simply buy less, use what we already have longer, repair when we can, and resist the constant pressure to replace things just because something newer exists.
Final Thoughts
If I had to give someone the shortest possible answer, I’d probably say this:
Eat lower on the food chain, travel lighter, and buy less.
That may not be the flashiest sustainability advice, but it is some of the most honest.
Because the biggest sustainability changes usually are not the most visible ones. They are the choices that quietly reduce our impact in the places that matter most.
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Take a look at some content that can bring sustainability into your classroom.
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