As humans we have made many things to show what humanity is capable of. There are pretty much humans everywhere on earth.

So what would happen if us, the humans disappeared?

If every human was suddenly...

Gone.

Things such as oil refineries that require human help and function will soon malfunction. In this case these oil refineries will explode creating fires that last for months on end with no firemen.

Nuclear power plants will also malfunction and cause Fallout to spread for miles, covering lot's of places in radioactive waste for years.

With no humans to feed your pets I'm sorry but they would die or even begin to roam the neighborhood. Rodents would thrive with no pest control.