Disposal of waste - this is one of the most important problems in the world. i think, it is very dangerous for our planet and everyone must to think about it. In the past, people didnt think about it, but now it become very important. People started to incinerate waste, but it is bad for nature, so people started to sort the waste. Paper, bits of iron must be separate. It is the first problem. The second problem is conveyance of waste. There are many problems of disposal of waste, but we must to find decision for this.