Protesters have erected barricades and banners in the wood
Environmental campaigners have launched what they hope will be Scotland's first climate change camp.
The protesters, at Mainshill Wood in South Lanarkshire, said they wanted to follow the tradition of similar camps in England and across Europe.
A solidarity camp already exists on the site, opposing Scottish Coal's plans for an open cast mine in the area.
Organisers said they would hold workshops how to take effective radical direct action.
They said the location of the week-long climate change protest event had been kept secret until now in order for preparations to be made without too much disruption and repression from the police.
Scottish Coal has been given permission to mine about 1.7 million tonnes of coal from the Lanarkshire site.
Campaigners want to build on the existing solidarity camp at Mainshill
Last month, an eviction notice was served on about 30 campaigners who dug themselves into tunnels in the wood.
People living nearby have also raised objections about the coal firm's plans for the area.
Organisers of the climate change camp said they would use it as a base for taking direct action against "a number of climate criminals in the central belt region".
A spokesman added: "If you want to take control of your life, of our society, and stand up for what you believe in all in the face of powerful and polluting corporations, then join us at climate camp."