all forestry and logging work, in particular pruning, felling, stump grinding and all activities related to wood processing, as well as all planting and tree care work, including all services related to the creation, development and maintenance of parks and gardens and all landscaping work; all snow removal or roof cleaning work; all road construction work, including those related to building and rope work, as well as all repair, maintenance and high-rise work, and more generally all construction work on the ground and in the air (cf. statutes for full purpose).