Most Government of Canada documents are available freely on the web and are searchable via the Government of Canada Publications website. For Government of Canada documents published prior to 1991, check out Library and Archives Canada online search.
Many Government of Ontario documents, including those from the Ministry of the Environment, Conservation, and Parks, are available in Ontario Government Documents (Our Digital World). Ontario Ministry of the Environment Reports, 1970-2007 are available on the Internet Archive.
Check out Tribunals Ontario - Environment and Land Division for Assessment Review Board, Board of Negotiation, Conservation Review Board, Environmental Review Tribunal, Local Planning Appeal Tribunal, and Mining and Lands Tribunal decisions.
For Kingston and Region municipal documents, try:
UN Environment Programme (UNEP) - Publications and data repository
Intergovernmental Panel on Climate Change (IPCC) - Reports, technical papers, and supporting material repository