Global News

Founder Mark Zuckerberg outlined the rationale in a Facebook post, saying content from "businesses, brands and media" had begun to crowd out the more personal moments which he said are at the core of the network.

A joint investigation by the Star, Global News, National Observer, the Michener Awards Foundation and journalism schools at Ryerson and Concordia universities revealed a troubling pattern of secrecy and potentially toxic leaks in Sarnia, Ont.

Federal researchers have drafted a proposal that suggests hydrogen sulfide gas, which can kill a person in high concentrations, is a non-toxic substance under the Canadian Environmental Protection Act. Hydrogen sulfide, also known as sour gas, can leak from the wellheads, pipes, tanks and flare stacks of the oilfields.

Saskatchewan Energy Minister Nancy Heppner dismissed The Price of Oil investigation's findings, while inside the Ministry of Environment, a Saskatchewan official praised it as "thorough and impressive."

The Trudeau government says its plans to toughen Canada's environmental laws could address serious health concerns exposed by a joint media investigation into Sarnia's petrochemical valley.

Saskatchewan government has insisted that public safety is its "number one priority," while declining all interviews related to The Price of Oil investigation.

The Price of Oil is the largest national journalism collaboration in Canadian history. Here's how it was put together and what it means for Canadians.