Environmental art

What is environmental art? It usually encompasses a number of branches and different works, but they have in common their concern about the environmental crisis.
Have a look at its history, its qualities, its different categories and some artist's works.
Some examples:
– Landart
– Activist art
– Edith Meusnier
– Marco Casagrande
– Caroline Laengerer
– Milton Becerra
– Cecilia Vicuna