Fine Gael and Fianna Fáil have invited the Green Party leader Eamon Ryan to further talks on forming a government.
Leo Varadkar and Micheál Martin though stopped short of a key commitment to reduce carbon emissions by 7 per cent a year.
They say it could be considered but there has to be more talks on how that would work at a practical level first.
Taoiseach Leo Varadkar says his party is committed to addressing climate change.
"It's hoped that the Green Party would give it close consideration.
"We'd be very keen to enter formal talks on forming a government as soon as they're willing to do so, if they're will willing to do so.
"The target they've set of 7% is extremely ambitious, it is an ambitious target.
"But we accept we need to be more ambitious when it comes to climate change."
