Able to continue over a long period of time without causing harm or running out of resources.
“Switching to solar-powered streetlights would be a more sustainable choice for our city.”
“This option offers a sustainable solution that will benefit future generations as well.”
Use 'sustainable' in Task 2 when the survey question relates to environmental, financial, or long-term community planning. It is a high-value word on CELPIP because it shows you are thinking about long-term consequences, not just immediate benefits.
Synonyms: viable, long-lasting, eco-friendly