我们必须考虑这些能源的可持续性。

We have to think about the ___sustainability of these energy sources.

国家和社会应负责确保环境的可持续性并防止进一步损害。

State and Society should be held responsible for ensuring the environment's ___sustainability and for preventing further damage.

公司的长期计划侧重于经济可持续性。

The company's long-term plan focuses on economic ___sustainability.