[2] GreenPAC's first campaign was during the 2015 Canadian federal election, in which they endorsed eighteen candidates for the House of Commons of Canada from four national parties who were deemed to have strong environmental track records by a panel of Canadian environmental experts.

[7] GreenPAC encouraged Canadians to support these endorsed candidates' campaigns through donations or by volunteering.

Five candidates for the Legislative Assembly of Manitoba, representing four registered parties in the province, received endorsements from GreenPAC:[9] In the 2017 British Columbia provincial general election, GreenPAC endorsed six candidates for the Legislative Assembly of British Columbia, who represented three registered parties in the province:[10] For the 2018 Ontario provincial general election, GreenPAC endorsed eight candidates for the Legislative Assembly of Ontario, who represented four registered parties in the province:[11] During the 2019 Canadian federal election, GreenPAC endorsed twenty-four House of Commons candidates from four national parties and one independent candidate who were deemed to have strong environmental track records by a panel of Canadian environmental experts.

GreenPAC encouraged Canadians to support these endorsed candidates' campaigns through donations or by volunteering.

[12] The following 25 candidates were endorsed by GreenPAC in the 2019 federal election: During the 2021 Canadian federal election, GreenPAC endorsed thirty-six House of Commons candidates from five national parties who were deemed to have strong environmental track records by a panel of Canadian environmental experts.