As Lovelock’s Gaia principle, that the earth is a living organism suggests, humans will have to go if they continue to imperil its existence through global warming/climate change, unfettered growth, the struggle for decreasing water supplies, environmental and species destruction etc..
The idea is that the sculpture should be huge - as a statement of the relative amount of damage that humans have done compared to other species. The size would also be important as a environmental political statement to awaken people to the impending disaster of unchecked human activity.
I met a traveller from an antique land
Who said: Two vast and trunkless legs of stone
Stand in the desert. Near them, on the sand,
Half shrunk, a shattered visage lies …
Nothing beside remains. Round the decay
Of that colossal wreck, boundless and bare,
The lone and level sands stretch far away.
The sculpture would be in the tradition of Land Art following in the shadows of people like Robert Smithson, Harriet Feigenbaum, Denis Oppenheim and Michael Heizer in America, Doris Bloom and William Kentridge in South Africa and Richard Long in England.
The scale of the project would mean that there would need to be an elevated viewing platform in its centre.
I see the sculpture as having an educational component in which local schools could be involved in producing a booklet for visitors writing about subjects such as global warming and environmental damage.
Ideally it would also be in an area of economic deprivation being able to provide some employment around the building and maintenance of the site as well as attracting some tourist revenue.
Possible other stakeholders include NGOs like Greenpeace and WWF, local environmental groups, local councils etc.