The agency will work on campaigns to support SNH's launch of an "outdoor access code", which aims to promote responsible behaviour in the countryside and outdoors.
SNH is a charitable trust that works in partnership with land-owners.
MediaCom Scotland has also won business from the launch of ProjectScotland and The Scottish Information Commissioner.
ProjectScotland is a partnership between private, public and voluntary sectors that aims to provide volunteering opportunities for 16- to 25-year-old Scots.
The Scottish Information Commissioner is a Whitehall-funded body that aims to promote the Freedom of Information Act.
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