Chọn từ phù hợp nhất để điền vào chỗ trống trong đoạn văn sau

One of the reasons why our environment is ___(1)___ is that each household produces a lot of rubbish every day. In order to reduce the pollution, we need to increase the volume of rubbish that is recycled because we cannot carry on ___(2)___ and burning rubbish forever. This means that we should reduce the ___(3)___ of rubbish we produce and encourage people to reuse and recycle. We also need to have a strict punishment for those ___(4)___ throw rubbish on the streets, in the ponds, rivers and seas. Besides, we ourselves should be aware ___(5)___ keeping our environment green, clean and beautiful.