The Transport Minister has said he is 'going for' a plan to take one in five cars off Irish roads by 2030.
It is part of targets in an updated Climate Action Plan under Minister Eamon Ryan, following a Cabinet re-shuffle on Saturday.
Drafts of the plan have set a 20% reduction in cars and a 10% reduction in cattle to cut emissions.
The final plan has yet to go before a Cabinet subcommittee, with the document set to go to Cabinet on Wednesday.
Minister Ryan told Newstalk Breakfast this will see all sectors affected.
"Each sector has to step up to the plate," he said.
"Agriculture much less than others; agriculture is about a quarter of the emissions [that] have to reduce.
"In transport it's about half, in the likes of energy it's up to 75%.
"So some sectors will have to do more than others, but every sector will have to play its part".
Cutting the national herd
He said the national herd will also have to be cut.
"There will be lower numbers of cattle, but there will be higher income for a whole variety of different farming groups," he said.
On reducing the numbers of cars on the roads, he said this is probably the most challenging.
"We do need to switch towards much more public transport, much more active travel - but also reduce the need for travel.
"We're using things like changes that are happening in remote working, in town centre-first strategies, in building back in the centre of our cities so there's not necessarily everyone having to do a long commute.
"A complete pivot in transport is what we needed [sic]."
'We can do it'
Minister Ryan said the targets are based on scientific analysis.
"All the sectors have got huge challenges - it's beyond compare - but we are going for it.
"The Climate Action Plan which is being set out, agreed hopefully by Cabinet on Wednesday, it's done on really detailed assessment of each sector.
"It's done on scientific analysis of what's happening at present, what can we do to change and what would that lead to.
"Yes it shows we can do it - no one should underestimate the scale of that change and the challenge," he added.