A Greenpeace survey suggests many people are sceptical about the recent ban on restaurants giving customers plastic cutlery, saying it does little to reduce waste.

The green group interviewed around 1,000 adults in May, seeking their views on the move.

Over 60 percent said they felt the new rules have little impact on waste reduction, while seven in 10 said they still threw away disposable cutlery made from alternative materials such as pulp or bamboo.

Greenpeace campaigner Leanne Tam said on Friday that it means little that the cutlery is eco-friendly, if it still ends up in landfills.

In an effort to raise awareness on sustainability, the group collaborated with local artist Kevin Cheung to create an eight-metre whale-shaped installation from over 2,000 pieces of disposable tableware. It will be on display at the West Kowloon Cultural District until Sunday.

"This whale shows the volume of disposable cutlery used ... our environment is still suffering," Tam said.

Greenpeace is calling on authorities to subsidise restaurants which provide reusable tableware with takeaway orders, saying it is the most direct means to cut down waste.