Offset your carbon footprint

By offsetting your carbon footprint with CHASE Africa you'll be funding tree planting in Kenya through our partner "Friends of Mau Watershed" (FOMAWA). You can read more about the project in the FAQ section below.

Pick a quick offset

We've calculated a number of carbon footprints, along with the number of trees that we'll plant to offset that footprint.

1 tonne


4 trees

Equivalent to a return economy flight from London to Cyprus

2 tonnes


8 trees

Equivalent to 8,000 miles (average UK annual mileage) in a small car

4 tonnes


16 trees

Equivalent to the typical annual emissions from electricity and gas usage in a UK home

8 tonnes


32 trees

Equivalent to the annual emissions from food production for a family of four who eat meat 3–4 times a week

10 tonnes


40 trees

This is the average carbon footprint of someone living in the UK

You pay £10

We plant 4 trees


You choose the tonnes

If you know how much carbon dioxide you would like to offset, you can enter it here and we'll tell you the cost and how many trees will be planted to offset your CO₂ emissions.

I would like to offset

tonne of carbon dioxide

(Minimum one tonne)

You pay £10

We plant 4 trees

Please let us know your e-mail address so that we can acknowledge your payment.
We'll only use your address for this purpose.

Your payment to CHASE Africa is a donation that will be used to fund the planting of the number of trees shown.
All of our payment processing is handled by PayPal.
When you click on "Pay now" you will be taken to COMMUNITY HEALTH AND SUSTAINABLE ENVIRONMENT – CHASE Africa's PayPal page where you can login and pay for your carbon footprint offsets.

Charity Gift Aid Declaration

Boost your donation by 25p of Gift Aid for every £1 you donate.

Gift Aid is reclaimed by the charity from the tax you pay for the current tax year. Your name and address are needed to identify you as a current UK taxpayer to enable us to process the Gift Aid claim.



By checking the box above you declare:

I want to Gift Aid my donation to Climate Stewards (Charity Number 1141108).

I am a UK taxpayer and understand that if I pay less Income Tax and/or Capital Gains Tax than the amount of Gift Aid claimed on all my donations in that tax year it is my responsibility to pay any difference.

Please notify us if you:

  • want to cancel this declaration
  • change your name or home address
  • no longer pay sufficient tax on your income and/or capital gains

If you pay Income Tax at the higher or additional rate and want to receive the additional tax relief due to you, you must include all your Gift Aid donations on your Self-Assessment tax return or ask HM Revenue and Customs to adjust your tax code.

Frequently Asked Questions

We each have a carbon footprint from activities such as driving, flying, heating our homes, powering all of our "devices", etc. There is also a part of our footprint we have no control of - our share of national emissions for schools, hospitals, prisons and government.

This footprint is measured in tonnes of CO₂e - carbon dioxide equivalent - though we generally just refer to CO₂. Carbon dioxide is one of the three main greenhouse gases (GHGs - the other two are methane and nitrous oxide) that form a "blanket" round the earth. Without this blanket the earth would be uninhabitable. We are making this blanket thicker by emissions from our global activities - mostly the burning of fossil fuels, but food production has a big part to play. This is causing global temperatures to rise (climate change) which is having impacts around the world (unpredictable and worsening weather, floods, droughts) which are affecting the poorest amongst us the worst.

Carbon offsetting is defined as "a compensatory measure made by an individual or company for carbon emissions..." (Collins dictionary).

In practice, offsetting is the process of acknowledging our impact on the planet and doing something about it. Money from carbon offsetting is used in developing countries to fund projects that will either remove carbon dioxide from the atmosphere (e.g. tree planting) or that will help people avoid carbon emissions (e.g. cookstoves that reduce emissions from charcoal burning for cooking).

Before offsetting, the best thing we can do is reduce our own carbon emissions. Offsetting recognises that we can never reduce our footprint to zero.

School children play amongst the eucalyptus trees at Tengecha Primary School in Kenya
School children play amongst the eucalyptus trees
at Tengecha Primary School in Kenya
FOMAWA plant Eucalyptus woodlots on schools around Molo and Rongai in western Kenya. Based in the town of Rongai, FOMAWA was founded in 2001 and works across a large area with the aim of conserving and protecting the Mau forest and its watershed for the present and future generations.

FOMAWA help and advise farms and schools on commercial tree planting – this relieves pressure and demand on indigenous forests which means they are conserved and have a chance to regenerate.

Over the last couple of years, some of the schools that joined the project at its inception have been able to harvest and sell a proportion of the trees that they have grown – bringing much needed income. Each tree is worth around 3,500 Kenyan Shillings, just under £27, and each school plants, on average, 425 trees. Wood from the trees will be sold for electricity poles and timber, the rest will be either sold in the local community as firewood or used by the school as firewood. Trees are harvested at 10 years and the coppiced stumps are allowed to regrow. Plantations can be harvested two or three times.

FOMAWA is run by Richard Muir (Chairman) and Jacob Mwanduka (Executive Officer).

  • Now retired, Richard spent forty years with the tea company James Finlay (JF) which has large tea estates in Kenya and elsewhere. It is the most diversified, and probably the most successful tea company in the world. Richard was the Executive Chairman from 1990 to 2001 when he retired to Kenya where he has a small farm near Molo in Nakuru. He became chairman of FOMAWA in 2001.
  • Jacob has over 24 years working experience with various reputable NGOs in Kenya. From 1978–90 he worked for ActionAid – Kenya. Then from 1991 through to 2001 he worked for World Wildlife Fund (WWF) on a project which was dealing with environmental issues affecting Lake Nakuru. Jacob joined FOMAWA in 2001 as the executive officer and he is the secretary to the board.

For every £10 that we receive:



  • Our payment processing transaction costs = 34p
  • UK project admin costs = 80p
  • Money sent to Kenya for tree growing = £8.86

The money that we send to FOMAWA in Kenya is sent as unrestricted funds to be used for tree planting and growing projects at local schools. FOMAWA uses this money to pay for seedlings, fencing to protect the young trees, fertilisers and other project "consumables". Travel and staff costs are also included. FOMAWA sends CHASE Africa regular reports on progress - please contact us if you would like to know more.

The FOMAWA land-rover drives through a stand of eight year-old eucalyptus trees
The FOMAWA land-rover drives through a
stand of eight year-old eucalyptus trees
Our carbon calculations are based on data supplied by FOMAWA and a reserach paper published by Kuyeh et al entitled "Allometry and partitioning of above- and below-ground biomass in farmed eucalyptus species dominant in Western Kenyan agricultural landscapes".

The paper provides an allometric equation and coefficients that, given the diameter at breast height (DBH) for Eucalyptus (multiple species), allows for the estimation of the above- and below-ground biomass. From the biomass it is possible to calculate the amount of carbon the tree contains. Kuyah et al's paper is based on data collected in the Kakamega region of western Kenya which is climatically and agriculturally similar to the Molo/Rongai area in which FOMAWA works.

Typically, FOMAWA harvest trees at 10 years. Data from FOMAWA shows that 10 year old trees in the field (i.e. current stocks) would typically have a DBH of 25cm, with sizes ranges from 22cm to 28cm. Calculating the carbon content of any tree relies on knowing its carbon fraction – the proportion of the tree that is sequestered carbon. Kuyah et al give the carbon fraction of kiln dried Eucalyptus as 47.5% based on element analysis.

Based on molecular weight, carbon dioxide weighs 3.67 times as much as carbon. So, if you know how much carbon is in the wood, you know how much carbon dioxide has been removed from the atmosphere - the O₂ part of the CO₂ is released back into the atmosphere for us to breathe.

For 425 trees planted on an acre of land we would expect that over 10 years the trees would sequester a total of 234 tonnes of CO₂ in above- and below-ground biomass (425 × 0.551). But the story doesn't end there...

In terms of carbon sequestration potential for the sale of carbon offsets we can only consider the following:

  • The stem – of which it is estimated that 25% of the stem biomass will either be burnt as firewood or lost as the stem is cut into logs/timber. This leaves 75% that will be providing long-term carbon storage as timber and electricity transmission poles.
  • Below-ground biomass – the roots and stump will be left in the ground and produce new growth (coppicing) so it is reasonable to include the sequestered carbon from the roots on the basis that they will continue to live, support further tree growth and therefore not rot and release CO₂ back into the atmosphere.

This means that of all the carbon sequestered over those 10 years, approximately 80 tonnes of carbon dioxide will ultimately be returned to the atmosphere after harvesting from being burnt as firewood, or lost during logging. In terms of biomass – 57 tonnes of harvested timber will lock up carbon long term, a further 30.9 tonnes will remain in the ground as living roots. Firewood will account for the remaining 39.7 tonnes. The leaves (6.8 tonnes) will either be burnt or used elsewhere.

In any tree growing project there is always a risk that trees will be lost for a variety of reasons. Building a buffer into the carbon sequestration potential calculations allows for the risk of any future loses to be accounted for. The size of the buffer is somewhat subjective, but a very conservative buffer for this project would be 20% of sequestered carbon. Data from FOMAWA shows that over the last 12 years the average survival rate is 93.2% (i.e. 6.8% of the trees are lost). Taken over the last five years the survival rate is 96.4% due to improved seedling stock and procedures on the ground. Thus a 20% buffer should prove to be more than adequate. The buffer covers any of the following loses:

  • Disease;
  • Pest;
  • Fire;
  • Damage due to animals;
  • Theft of wood to be used as firewood; or
  • Land loss (for example due to redevelopment of a school).

The list is non-exhaustive.

Allowing for a 20% buffer means that, per 425 trees planted, of the 153.4 tonnes sequestered, 30.7 tonnes will not be available to sell as offsets - leaving 122.7 tonnes available that you can buy from us.