Environmental campaigners have welcomed the vision set out in the Government's climate change plan but raised "serious concerns" about how it will be achieved.
Stop Climate Chaos Scotland highlighted the urgency of the draft plan being published shortly after confirmation that 2016 was the hottest year on record.
The coalition questioned the reliance on the "unproven voluntary effort and goodwill" of farmers to cut emissions in the agricultural sector, and said expected reductions in transport appear to depend too heavily on technological change.
Read more: New climate charge plan targets 66% cut in emissions by 2032
Chair Tom Ballantine said: "This new plan paints an attractive vision of the kind of low-carbon society we will be living in in 15 years' time - a cleaner, healthier, more prosperous Scotland.
"However, we have serious concerns about the plan's lack of new actions to deliver this vision.
"Clearly lots of work has gone into developing this picture of a low-carbon Scotland, and that is to be welcomed. Achieving this vision would put us alongside progressive countries around the world.
"Much of what was set out in today's plan is still at the pilot or consultation stage, and effort will now need to go into rapidly developing these into concrete policies."
Read more: New climate charge plan targets 66% cut in emissions by 2032
Sustainable transport group Transform Scotland agreed that the transport proposals rely "excessively" on technology change.
Director Colin Howden said: "Overall, we would have preferred to have seen more specifics on the volume of funds that will be invested to reduce emissions from the transport sector.
"From its £9 billion road-building programme to its current proposals for an annual £300 million Air Passenger Duty (APD) tax cut for the most polluting form of transport, it is very clear that the Scottish ministers are still also prepared to commit to policies that will increase emissions."
Read more: New climate charge plan targets 66% cut in emissions by 2032
Scottish Greens environment spokesman Mark Ruskell said the plan contains only half of the recommendations for action made by the independent UK Committee on Climate Change.
He said: "Scotland's economy and public health are at risk from inaction on climate change. While the Environment Secretary talks of ambition, we simply don't see the follow-through from her Cabinet colleagues."
He criticised the plan's reliance on "unproven" carbon capture technology, said there was "very limited" investment on warm homes, and called for more action to cut agricultural emissions.
He added: "If ministers are serious about cutting transport emissions, they cannot justify cutting Air Passenger Duty."
The Scottish Conservatives said the budget for reducing emissions from vehicles had been cut by £26 million, despite pollution levels from the sector only being 1% lower than they were in 1990.
The party's climate change spokesman Maurice Golden said: "What was clear from today's statement is that there are still no firm plans to deal with reducing transport emissions.
"To make matters worse, the SNP have chosen to slash the funding going towards making our transport more efficient, in addition to underfunding the programme for improving home energy efficiency."
Read more: New climate charge plan targets 66% cut in emissions by 2032
Scottish Liberal Democrat energy spokesman Liam McArthur also criticised plans to cut APD and said more progress is needed in heat and transport
"Having only met our climate change targets once in five years, we need a plan and a vision, backed by real financial muscle, that ensures we walk the talk on emissions reduction," he said.
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