You use sustainable to describe the use of natural resources when this use is kept at a steady level that is not likely to damage the environment.
environmentally friendly , eco-friendly , ecological
unsustainable
the management, conservation and sustainable development of forests.
森林的管理、保护和可持续发展。
Try to buy wood that you know has come from a sustainable source.
尽量购买来自于可持续性资源的木材。
A sustainable plan, method, or system is designed to continue at the same rate or level of activity without any problems.
unsustainable
The creation of an efficient and sustainable transport system is critical.
创建一个高效且可持续发展的交通系统是至关重要的。
a sustainable recovery in consumer spending.
消费开支的可持续性恢复。