Search our FAQ for answers to anything you might ask.


Greenr at its core is an information giver. We know everyone is smart and can make educated choices if only they are given the right information. From personal experience we know how hard it is to calculate the footprint of a certain meal vs another or calculate the carbon footprint difference between two modes of transport. That’s why our calculator is the most accurate one on the market. And it’s free! We are focusing our calculator on the travel and diet part of your lives because we feel those are changes and decisions, we can make every day. We know it can be hard to force your landlord to put double glazed windows or get your parents to insulate the loft… so instead we are allowing you to make your climate action about what you eat and how you get around.

  • Eat vegetarian food one day a week?

  • Walk to a meeting?

  • Swap your long-haul business flight to economy?

All are wins in our eyes. At Greenr we believe there isn’t a right or wrong way to live, but there is a Greenr way. We’re not about making anyone feel guilty, instead we want to reward every small positive change you make. We’ll even set challenges for you to push yourself.

The Calculator is the heart of Greenr. We are aiming to bridge the gap between scientists fighting climate change in the lab, and everyone else trying to do their bit individually, at work and at home.

We are using a vast range of academic studies and governmental databases in order to be the first carbon tracking app to allow app users to track their daily meals. By this we mean that you can record actual ingredients on a day-to-day basis not just approximate dietary habits. This allows users to experience a fun and informative way of tracking their daily activity, with instant feedback on the impact of decisions and activity.

As with every scientific calculation some assumptions are made. This is why the carbon footprint value you can see on your dashboard is an approximation.


We’ve covered how most of the activities in our daily lives contribute to adding carbon dioxide and other greenhouse gasses to the atmosphere. But is there a way to take them back out? There is! You can do that through buying certificates from certified carbon offset projects. Greenr selects projects that are accredited by Gold Standard or Verra. These charities have been around for decades and can guarantee that the projects that receive their certification avoid carbon dioxide from being added to our atmosphere. Here are a few examples of projects that Greenr supports:

  1. Forest conservation in Papua New Guinea: Trees are a great carbon sink. They need carbon for photosynthesis (GCSE biology here we go) and convert it into oxygen. However, if you cut down the tree and burn it you release all that carbon which is stored in the bark, back into the atmosphere! So, a forest conservation project is a great option. Trees that otherwise would have been cut down are saved due to carbon offset revenues. Farmers receive money and can afford to keep the forest on their land without cutting them down. Plus, it looks so lush doesn’t it?

  2. Renewable energy projects: Generating electricity using renewable methods (i.e., energy that is not depletable) such as wind, solar and hydropower is a great way to remove potential carbon from the atmosphere. The revenue generated from carbon offsets allows small wind farms to be built. Such a wind farm will generate electricity for a neighbouring town which otherwise would have received electricity generated by burning natural gas or coal. This is an example of a carbon offset project which avoids future carbon from entering our atmosphere.

The good news is if you support carbon offset projects for the amount of carbon you are responsible for then you will become carbon neutral! :tada:

At Greenr we love trees, but we don’t plant them to offset your carbon footprint. We’ve got a few reasons for that. Trees are amazing carbon eating machines, but they need to get pretty big before they can capture enough carbon. In fact, a single tree can only offset 1 tonne of CO2 in about 100 years. That’s a pretty long time, and lots of things can happen to your tree. What if it’s cut down, or has a disease? In order to guarantee that the carbon you have offset is in fact offset we choose projects with a shorter “carbon buy back period”. These projects include renewable energy, forest conservation and bio cookers. If you’re really passionate about forests, then the forest conservation project is great one as the trees are already fully grown and capture as much CO2 as they can. The revenues from carbon offsets enables landowners to keep the forest intact and stop trees from being cut down.

In theory you can offset your yearly carbon footprint and be carbon neutral, however we don’t believe that is the most sustainable way of doing things. If everyone continued to live an unsustainable lifestyle and just offset all their emissions, we would soon run out of carbon offset projects. Instead, it is best to find ways to easily cut down your carbon by swapping your diet and travel habits to less carbon intensive ones and then offset what’s left over!

We work closely with different carbon offset accreditors such as Gold Standard and Verra. Both of them manage best practice standards for climate and sustainable development interventions to maximise the beneficial impact of each tonne of CO2 offset. Every project goes through rigorous scrutiny before being approved. In short, each project needs to be:

  • Additional: it would not have happened without the support from carbon offsets.
  • Contained: it won’t cause emissions to increase in another area.
  • Permanent: it is protected against destruction by human or natural causes
  • Sustainable: more than reducing carbon it also has a positive impact on communities.
  • Verified: it is routinely inspected and verified by an independent third party
  • Unique: each project has a unique ID on a public ledger and can only be counted once

Greenr only purchases verified projects, which means you will always be able to follow the trace of your own certificate to the credits that Greenr has bought which in turn will be listed on a public ledger. On top of that we will publish quarterly updates of each project so that you can see exactly what impact your support has had.

We’ve discussed our opinions on tree planting project, but how do we pick the rest? We only fund carbon offset projects which meet the highest verification standards, such as Gold Standard or Verified Carbon Standard. But we are lucky enough to have a vast choice amongst those projects! So on top of accreditation, we look for diverse projects which may align with all of your passions. Don’t hesitate to drop us an email if you would like to see a project in particular. On top of that we look for projects which meet other important sustainability and development standards and contribute positive impacts to the local communities. These are well represented by the UN Sustainable Development Goals (SDG). In the app you will be able to see tags near each project. These represent the SDGs that either Gold Standard or Verra have identified the project as meeting. Check out our offset projects here!


The world will not avert the climate crisis unless thousands of businesses and billions of people make meaningful changes to their day-to-day activities.

Organisations really want to impact climate change but are growing overwhelmed and anxious at the scale of this issue. We need to bring solutions together that are strategic, practical and measurable.

This is exactly what Greenr does.

Every organisation we talk to, is telling us they really want to tackle this, and their employees are asking them to do more, but the question is how? And that’s what we are focused on. We are focused on helping businesses of all sizes transition to net zero by putting environmental data at the heart of every business decision. With our Sustainability as a Service Platform.

The first step in managing any problem is measure it, which is why we have developed our Greenr Business Calculator.

It allows you to:

  • Enter your emissions data yourself without the need for expensive data auditors or consultants

  • Estimate your scope 1, 2 and 3 emissions based on office bills and best-guesses of your employee’s commute

  • Refine your scope 3 emissions through distributing the Greenr App to all your workforce

  • After completing the Greenr Business Calculator you will receive a breakdown of your emissions, actionable insight and obtain the possibility to download an in-depth report to show your stakeholders.

Get started here

Carbon Footprint

Carbon Dioxide is a gas, just like oxygen or nitrogen which can be found in our atmosphere. The air we breathe is made up mostly of nitrogen and oxygen with a tiny bit of CO2, only 0.04% in fact. CO2 is very important for earth because it’s what keeps it warm and liveable! CO2 is what we call a greenhouse gas. It’s different to Oxygen and Nitrogen in that regard. A greenhouse gas (GHG) like CO2 absorbs heat during the day and then releases it gradually over time; just like bricks in a fireplace after the fire has gone out. There are other greenhouse gasses in our atmosphere, like methane and nitrous oxide. CO2 is actually less good at trapping heat than those two other gasses but there’s a lot more CO2 in our atmosphere and it also stays in our atmosphere for longer. This results in CO2 being responsible for about 2/3rd of all global warming effects.

Well CO2 is needed so that we don’t all get super cold but the problem we are facing now is that there is too much CO2. The burning of fossil fuels has increased the amount of CO2 in the atmosphere by too much which has tipped the balance. The Earth is supposed to warm during the day and cool at night on a stable cycle but now the amount of CO2 in the atmosphere stops it from cooling down properly and so year on year it gets a tiny bit hotter.

We know warmer summers and slightly milder temperatures may not sound that bad but really it really puts a spanner in the works. Warmer climates in some areas means the whole climate cycle gets out of whack. Oceans evaporate quicker which causes more rainfall which can result in extreme weather events like floods, landslides, snowstorms etc. Warmer climates also mean more heatwaves which can overpower the human body. All in all, it’s not great news and that’s why we should all try to stop it from happening.

So, we’ve discussed what CO2 was and Greenhouse Gasses in general. But what does this have to do with you? This is where your carbon footprint comes in. Every activity that you do will potentially emit some carbon dioxide (or carbon for short). Here are some examples: 1. If you drive to work in a normal car you are burning fossil fuel to power the engine. The exhaust gas coming for your car has CO2 in it (and other GHGs) which go straight into the atmosphere. 2. The burger meat in your beef burger had to come from a cow which had to be raised on a field for a couple of years, fed some grain and given some water. The cow had to convert food into muscle to grow and also emitted some GHGs such as methane. The water and grain it used it also accounted for in the carbon footprint using “equivalence” 3. The electricity you use in your home will have been generated using different methods. Some methods are green such as solar and wind and therefore don’t have much carbon footprint. But other methods use fossil fuels such as coal, gas and oil which, like your car, emit CO2 and other gasses when they are burnt to generate electricity.

Alright so now that we’ve covered some habits that contribute to your carbon footprint and that you’re probably feeling a little overwhelmed – how can Greenr help?

You can find all of our calculations and sources in our methodology document.