On the other hand, alternativefuels do have drawbacks.
另一方面，替代燃料确实也有缺点。
2
Using alternativefuels and improving energy efficiency is thus both an ecological necessity and a technological challenge.
因此，使用替代燃料和提高能源效率既是生态需要，也是技术挑战。
3
Customers can bring shoes of any brand into an Adidas store to be shredded and turned into alternativefuels for energy creation instead of being burned as trash.