The “Say Yes” demonstrations were held in a series of simultaneous political demonstrations in Australia on 5 June 2011 to coincide with World Environment Day .  The gatherings have Were Organized demonstrations of Some public media for political actions is climate change in Australia, Including Support for mitigation , investment in renewable energy and decommissioning of fossil fuel power stations and polluting industry. The largest individual gatherings attracting 10,000 in Melbourne and 8,000 in Sydney . 
The “Say Yes” Cate Blanchett and Michael Caton appearing on a national television advertisement. 
The demonstrations were organized by Say Yes Australia, a coalition of community groups, environmental organizations, unions, associations and other groups and was apolitical. All demonstrations were peaceful with no injuries or arrests.
The Federal Treasurer, Wayne Swan , attended the Brisbane rally.  In Canberra, the ACT Chief Minister, Katy Gallagher , was in attendance. 
Rentals & attendance
- Melbourne – 10,000 
- Sydney – 8,000 
- Brisbane – 5,000  or 2,000 
- Adelaide – 5,000 or 3,000 
- Perth – 3,000 
- ^ Jump up to:a b c d (5 June 2011). Thousands ‘Say Yes’ at carbon price rallies . ABC News. Australian Broadcasting Corporation.
- ^ Jump up to:a b Alexandra Smith (6 June 2011). “10,000 in Sydney say ‘yes’ to a carbon tax” . The Sydney Morning Herald . Fairfax Media . Retrieved 10 July 2011 .
- Jump up^ “Canberrans ‘Say Yes’ to carbon price” . ABC News . Australian Broadcasting Corporation. June 6, 2011 . Retrieved 10 July 2011 .
- Jump up^ Dan Nancarrow (5 June 2011). Brisbane rally says ‘yes’ to carbon price. Brisbane Times. Fairfax Media.
- Jump up^ Thousands ‘say yes’ at carbon price rallies. ABC News. Australian Broadcasting Corporation.
- Jump up^ (6 June 2011). Climate change rally attracts 5000 supporters to Victoria Square. Adelaide Now.
- Jump up^ (5 June 2011). Thousands rally in Perth for carbon tax. WA Today.