If 30 minutes is daunting, this test can be modified by simply performing three 5 minute hard, sustainable efforts with 5 minutes rest between each effort. (bengreenfieldfitness.com)
In addition to more manageable and sustainable efforts by more people, we need to consider what kind of paradigm shift is needed. (slaw.ca)
Here, through sustainable efforts and local initiatives, they have committed themselves to protecting their fragile eco-system, which has been recognized and awarded the Certification for Sustainable Tourism in Costa Rica. (traveling-in-heels.com)