These illustrative images show infrastructure types and are not TRAIS project photography.

• Offshore wind farm by Kim Hansen, edited by Richard Bartz and Kim Hansen, under CC BY-SA 3.0.
• Solar farm at Krishnapuram by Saiphani02, under CC BY-SA 4.0.
• Deer Island wastewater treatment plant by Doc Searls, under CC BY-SA 2.0.
• Yehudit bridge under construction by Alexey Bogoslavsky, under CC BY-SA 4.0.