Opponents of plans to create energy from waste at a site near Perth have said Scottish Government targets on incineration are still too high.
The government wants to encourage recycling
Richard Lochhead announced on Thursday that he would place a 25% cap on the use of incinerators to treat rubbish.
However, the Tayside Environmental Action Group (TEAG) believes there are more suitable alternatives available.
The government said that burning waste was vital if the country wanted to meet European landfill regulations.
TEAG is campaigning against the building of an energy from waste plant at Binn Farm.
The group feels the SITA incinerator near Glenfarg would damage health and cause pollution.
Mr Lochhead told parliament that no more than a quarter of municipal waste would be used to generate energy by 2025 and "large, inefficient incinerators" would be rejected.
He said: "Such plants could easily become white elephants and drain public funds.
"They would also crowd out recycling and waste prevention."
Michael Gallagher from TEAG told the BBC Scotland News website that he had "mixed feelings" about the announcement.
He said: "25% of Scotland's rubbish to be allowed to be incinerated, that's still a heck of a big quantity."
"When you build an incinerator, it's going to be there for 25 or 30 years and it'll be there under a contract that the council will have to feed this thing x amount of rubbish every year.
"Mr Lochhead said that the 25% limit would apply not only nationally but also regionally, but does he mean within an individual council area, or does he mean within a waste area like Tayside?
"If it's within Tayside waste area, I'm hoping that will include the Baldovie incinerator in Dundee, in which case the 25% cap might already be reached."
A Scottish Government spokesman said: "We need energy from waste as being both compatible with the aim of zero waste and vital to meeting European landfill targets.
"However, we are determined to see that all new plants will be both efficient and clean."