Commitments to remove smaller trees as part of the BusConnects project is progress, according to the Tree Council of Ireland.
But it means the number of trees being felled has gone up by around 1,000 - that's expected to cost around two billion euro.
Around 13,000 people made a submission on the plans, while a second public consultation got underway yesterday.
"Mature trees are the really important ones, they will contain about five tonnes of timber, which is the equivalent of removing five tonnes of carbon from the atmosphere," said Eanna Ni Lamhna, who is vice-President of the Tree Council of Ireland.
The majority of trees along Baggot Street, Pembroke Road and St. Mobhi road - many of which have ribbons tied around them in protest of BusConnects - are to be spared under the revised plan.
But the National Transport Authority was unable to reduce the risk to the majority of homeowners whose front garden may be reduced in size to accommodate the overhaul of the network.
Under the plans, more 'bus gates' like the one at Trinity College will be brought in as well as more one way systems for private cars.