The promoter of Earth Hour was itself subject of some green criticism this week, over support for further investment into carbon capture and storage technology - also known as CCS or "clean coal".

The World Wildlife Fund has joined the Climate Institute, the Miners union and the Australian Coal Association in calling for more demonstration plants to test this technology.

Just this month, Australia's first carbon storage demonstration plant was opened at Otway basin in Victoria.

Already the NSW Government has put $100 million into a clean coal fund, and $500 million has been announced for a national clean coal initiative.

Unimpressed by the announcement, several environmentgroups picketed the WWF's Sydney office.

2ser's Jessica Minshall was there.