A History of Land Art, Ecological and Environmental Art in relation to Landscape Architecture

Environmental Art can be seen to have originated in the early 20th century, with Picasso, collage, Duchamp, readymade artworks, Cubism and Minimalism.
Or it can be seen to derive from the ancient world, including the Pyramids, Stonehenge and many projects in the history of landscape architecture and garden design.
Asking "what is the difference between Environmental Art and Landscape Architecture" this video sets the scene for a debate, using art projects by Charles Jencks (for Scottish National Gallery of Modern Art) and Tom Turner (for a Sea and Sand Mandala) as debating points.