After changes to their constitution, Harvie was elected co-leader of
Scottish Greens alongside
Lorna Slater in a
2019 co-leadership election. With Slater, Harvie led their party into the
2021 Scottish Parliament election and won eight seats, the most Greens ever elected to the Scottish Parliament.
Bute House Agreement In August 2021 after weeks of talks, he was at
Bute House with his co-leader
Lorna Slater and First Minister Nicola Sturgeon to announce a
power-sharing agreement that would see the Green party in government for the first time in the United Kingdom. There was no agreement on oil and gas exploration, but the government now argued that it had a stronger case for a national independence referendum and pledged to hold an independence referendum before the end of 2023 if the
COVID-19 pandemic subsides. As part of the agreement the Green Party would have two ministers in government.
Junior minister; 2021 to 2024 On 30 August 2021, Harvie was appointed
Minister for Zero Carbon Buildings, Active Travel and Tenants' Rights. He and Slater are the first Green Party politicians in both Scottish and UK political history to serve in government. In April 2023, Harvie was the subject of criticism after Mandy Rhodes of
Holyrood magazine claimed she felt bullied by him. As part of the Scottish budget process in 2023, he attended emergency Cabinet meetings as part of efforts to finalize the Scottish budget and secure agreement between his party and the SNP.
COP26 During his tenure,
COP26 was held in his home city of Glasgow and Harvie used the occasion to raise the issue of Scottish independence with world leaders. He also got into a dispute with
Greenpeace, which had recently criticised Nicola Sturgeon. Sturgeon had asked the British Government whether the new
Cambo oil field near Shetland should be "reassessed" in light of the climate crisis. However, Greenpeace said fence sitting was not good enough and urged the First Minister to "stop hiding behind Boris Johnson" and oppose the oilfield. Harvie said the organisation did not understand Scottish politics and
the SNP's attachment to the oil industry. "I do think that we are more actively plugged into the Scottish political agenda than Greenpeace," Harvie told journalists. "And I do think Greenpeace, understandably, look at issues such as Cambo in a UK context and don't see it in a Scottish Parliament context.”
Gender policy Harvie supported the
Gender Recognition Reform (Scotland) Bill, which would have made it easier for people to change their legal gender in Scotland. He and
Lorna Slater proposed resigning from their ministerial posts in 2023 if the winner of the
2023 Scottish National Party leadership election and next First Minister delayed or rewrote the legislation. In April 2024, Harvie commented on the
Cass Review, a review of gender identity services in England, led by retired paediatrician
Hilary Cass. Harvie told the BBC that he did not see the Cass Review as a valid scientific document as he had "seen far too many criticisms" of it. After Harvie's statements, a Scottish Government spokesperson said that decisions such as those proposed in the Cass Review should be proposed by clinicians and not by politicians.
Ash Regan, an MSP who had defected from the SNP to the
Alba Party, lodged a
motion of no confidence in Harvie for "siding with ideology over science". After ending the Bute House Agreement, thereby removing the Greens from government, Humza Yousaf said that SNP MSPs had been "upset" by Harvie's comments, but that it had not "necessarily" been a factor in the termination.
Tenants' protections Harvie consulted on a 'New Deal for Tenants' in 2021, which would include rent controls, a right to have a pet and eviction protections. In October 2022, Harvie introduced the
Cost of Living (Tenant Protection) (Scotland) Act 2022 to freeze rents and ban evictions in response to the
cost of living crisis. The emergency legislation was the first bill to be introduced by a Green minister in the UK. The next year, Harvie extended the legislation, but removed the rent freeze in favour of a rent cap. His measures faced legal challenges by landlords who claimed that the measures breached the
European Convention on Human Rights. The measures were extended for a final time in September 2023, with Harvie promising the introduction of permanent rent controls. In October 2023, Harvie began to consult on what these may look like.
Zero carbon buildings In November 2023 Harvie consulted on proposals to require homeowners and businesses to change how homes are heated. He also confirmed that all homes will have to meet energy efficiency standards by 2033 and that all homes would need to replace gas boilers by 2045. The former proposal was criticised as creating a "ten-year timebomb" by the
Scottish Conservatives.
Retirement as a co-leader In April 2025, Harvie announced that he would not seek re-election as co-leader of the Scottish Greens in the
upcoming 2025 leadership election but will seek re-election as an MSP for the Scottish Greens in the
2026 Scottish Parliament election. ==Political views ==