Fianna Fáil finance spokesperson Michael McGrath has said the Green Party's response to the joint framework document put forward by Fianna Fáil and Fine Gael was "substantive" and raised valid questions.
The Green Party is seeking 17 commitments from Fianna Fáil and Fine Gael before entering any formal Government formation negotiations.
They include a pledge to cut greenhouse gas emissions by at least 7% annually.
Speaking on RTÉ Saturday with Cormac Ó hEadhra, Mr McGrath said a reduction of 7% in carbon emissions would have to be worked out in practice through taking expert advice.
"There has been certainly at Oireachtas Committee level a political consensus that this is where we need to move to and this is certainly what the science is telling us."
Mr McGrath said Fianna Fáil did not have a figure on carbon emissions, but he said the party fully accepts the need to be ambitious and radical in tackling the climate and biodiversity emergency.
Fine Gael's Colm Brophy said it was important to have conversations with all the smaller parties and with independents and he said nothing should be prejudged.
He said he welcomed engagement by the Green Party and he would like to see a meeting between the leaders of Fine Gael, Fianna Fáil and the Green Party.
Independent Wexford TD Verona Murphy, however, said the current policy platform being put forward by the Green Party is "fantasy".
She said that some commentators say that in the next two years Ireland could borrow €50bn and she said Brexit has not gone away.
Ms Murphy said a 7% reduction in carbon emissions would decimate industries such as farming and fishing.
"The current platform that the Greens have presented is unrealistic and can't be achieved in the current climate."
Responding, Green Party TD Roderic O'Gorman, said the scientific advice in relation to climate change says we need at least 7% reduction in emissions per annum between now and 2030.
He said this would not be easy to achieve and would require all parts of the economy and society to work together.
"It's scientific advice, it's legal advice because it's the legal obligations we have signed up to within the EU to meet our obligations under the Paris Agreement but it's also a political consensus in this country because the Oireachtas Joint Committee on Climate Action agreed that that was the figure that we needed to achieve."
Asked if a 7% reduction in carbon emissions every year was possible, Labour Senator Marie Sherlock said that anything is possible if we want it to happen.
"It's about getting that balance right between livelihoods and the overall reductions."
