The panel, headed by Union water resources secretary Shashi Shekhar, had environmentalists and academics as members.
"It is not fair. You cannot make sweeping comments on people who have devoted their life to environment. We are warning you people that if anybody passes strictures, we will not hesitate to take action against them," a bench of the green tribunal headed by Justice Swatanter Kumar told the planning body today.
The DDA's counsel had questioned the conclusions of the seven-member expert panel that had concluded it would take over 40 crores, and a decade's work, to reverse the damage done by the three-day event organized by Art of Living.
But the planning body isn't the first one to question the expert panel's findings. AOL's Sri Sri Ravi Shankar has consistently rejected conclusions that the World Culture Festival had cost the environment heavily.
The expert panel's finding doesn't look too good on the DDA either, which environmentalists said, had done a sloppy job of protecting the ecologically fragile floodplains.
DDA officials had permitted the cultural event by the Art of Living (AOL) foundation but when asked to justify their decision, had later claimed that they were not aware about the scale of the event. It included a 7-acre stage for 35,000 musicians and dancers, newly built dirt tracks and 650 portable toilets across 1,000 acres.