Cheryl Gallant's recent Report from Parliament outlines those concerns and the action being taken in some quarters to combat it:
... the [United Nations] has very specific land use policies they would like to see implemented in every village, town, city, county, province and nation. The specific plan is called United Nations Agenda 21 Sustainable Development, which has its basis in Communitarianism. Most Canadians have heard of sustainable development, but are largely unaware of the U.N. initiative Agenda 21. A non-governmental organization headquartered in Toronto called the International Council of Local Environmental Initiatives, ICLEI, is tasked with carrying out the goals of Agenda 21 worldwide.Take the poll at the bottom of Gallant's report.
In a nutshell, the plan calls for government to eventually take control of all land use removing decision making from the hands of private property owners. It is assumed people are not good stewards of their land and “the government” will do a better job if it is in total control. Individual rights in general are to give way to the needs of communities as determined by the governing body.
Elizabeth Nickson's excellent book "Eco-Fascists" (inspired by her personal experience on Salt Spring Island, BC) also deals with many of these issues.