Pylon on high-voltage transmission line near Bowmanville, Ontario.February 2016.

Insulators on high-voltage transmission line near Bowmanville, Ontario. February 2016.

High-voltage transmission lines leading away from Darlington Nuclear Generating Station near Bowmanville, Ontario. February 2015.

Cameco uranium facility on Lake Ontario shoreline in Port Hope, Ontario. The plant converts uranium into compounds used in the nuclear fuel chain in both Canada and the United States. February 2016.

Pickering Nuclear Generating Station and wind turbine, on Lake Ontario shoreline at the edge of Toronto. March 2016.

Wind turbines on prairie horizon, southwest Minnesota, August 2012.

Fracking well pad in Bakken district of North Dakota, with gas flare. June 2014.

Oil wells with gas flare, southern Saskatchewan. June 2014.

Preparing for repairs along Line 9B pipeline near Port Hope in Northumberland County, Ontario. The line was being converted to carry light crude from the Bakken region and diluted bitumen from Alberta. April 2014.

Trucks carrying fracking water and oil near Watford City, North Dakota, during the Bakken boom. June 2014.

Open pit lignite mine operated by Sherritt Coal, in southeastern Saskatchewan. June 2014.

St Mary's Cement plant in Bowmanville, Ontario, quarries limestone and makes cement in kilns fueled by coal and pet coke. February 2016.

The freighter Peter R Cresswell docked at St. Mary's Cement on Lake Ontario at Bowmanville. The plant quarries limestone and makes cement in kilns fueled by coal and pet coke. July 2015.

The Toronto Power Generating Station in Niagara Falls, just above Horseshoe Falls, was built in 1906 and mothballed in 1974. February 2014.