Treezilla, the monster map of trees, was launched in June 2013. It is a citizen science project that aims to map every tree in Britain through It is free and open to everyone to use, and local groups are encouraged to upload data about the trees in their area.

The database will represent Britain’s tree legacy, enable scientific investigations into tree diseases, their contribution to the ecosystem, and how climate change affects tree growth and health. Treezilla also calculates and displays an evaluation of the monetary value of the ecosystem services that the trees provide. These include capturing carbon dioxide, reducing flood risk and improving air quality. You can access it at

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