Robotic Lawn Mowers are becoming more and more popular, with the number of robotic lawn mower sold increasing 12% every year.

Seen as one of the first in a revolution of robotic helpers, along with the Roomba, that will soon be doing all of our work for us.

The common opinion is that using these new helpers is better for the environment due to the fact that they don’t emit any greenhouse gasses. The same argument is made for electric cars. 

While there is some truth to this the story is much deeper than that. 

Greenhouse gasses from production, operational energy requirements, and disposal of the unit once it comes to the end of its life all have an impact on the total impact it has on the environment.

We have done the research, to the best of our abilities, to look at the different points and see the real impact of these new robots, good or bad.

Production

Obviously, there will be a cost to produce a robotic lawnmower and a traditional petrol-powered lawnmower and what we are really looking at here is the different expected cost.

While we have not been able to find any concrete evidence on this we can expect that with the currently decreasing cost and improvements to production efficiency of batteries Robotic mowers will continue to have a lower impact. 

At the same time, traditional internal combustion lawnmowers require significantly more steel or other raw metal alloys to produce. This can be seen simply by the difference in the final weight of the machines. 

With the limited data we have available we can assume that the production is not a significant factor either way for these machines. 

Emissions from Operation

Operational emissions are the most important that we need to cover. There are a number of reasons for this but one of the biggest is due to the proximity that traditional lawnmowers have to our homes.

According to the Scientific American, 5% of American emissions come from petrol lawnmowers and this is a crazy figure to think of. Just but changing these over to electricity and getting that energy from green sources could have a big impact on the emissions of the USA and for that matter the world if this strategy was adopted more widely.

Robot Mower Emissions

So this one sounds like Robotic mowers would be the winner but let’s find out.

So, how much power a robot mower uses per year?

According to these statistics from Robomow, a robot mower will use anywhere from 30kwh to  400kwh per year depending on the size of the unit and the area it needs to mow. 

This would produce 21kgs to 280kgs of CO2 per year if coming from fossil fuel power plants.

This would be about the same as running the drier for 36 hours, or how much power an electric car would use to drive around 860 miles.

This sounds like a lot but we also have to think that if the power is coming from renewable sources like, solar, wind, or nuclear then the emissions would be 0.

Robot mower no emissions

In short, robotic lawnmowers, while potentially producing carbon now from fossil fuel power generation enable a much easier and faster switch to green energy as more come online.

They also

Traditional Lawnmower Emissions

Here is an extract of the findings from the EPA on gas-powered lawn mowers. 

The EPA found that gasoline-powered lawn mowers emit eight times more nitrogen oxides, 3,300 times more hydrocarbons, 5,000 times more carbon monoxide and more than twice the CO2 per hour of operation than electric lawn mowers.

This extreme difference in emissions paints a pretty bad picture of the humble old lawn mower. They contribute in a large way to urban smog production and are responsible for a large amount of pollution overall. 

According to this article, a single new petrol-powered model lawnmower is about as dirty in its pollution output as 11 new cars when run for the same period of time. Or for 1 hour of operation about the same as an 1100 mile drive in a Toyota Camry. 

Lawnmower pollution

Conclusion

So are Robot Lawn Mowers Bad for the environment? Well yes, at the moment they still cause emissions of CO2 and the production and disposal of them causes mining and water all affect the environment.

But… They are much better than the alternative.

Again this is a similar issue to what is said about electric cars. They are not great for the environment and a lot of the things we, as humans, create isn’t. But they are much better than their gas-guzzling, smog-producing brothers.