Garbage collectors, with their horse and cart, unload rubbish at the municipal dump in Nezahualcoyotl, on the outskirts of Mexico City, February 18, 2015. Hundreds of horse or donkey-drawn carts will disappear from the streets of a municipality in the state of Mexico, located on the outskirts of Mexico City, and will be replaced by motorized vehicles, local authorities said. Nezahualcoyotl, commonly known as Neza, has started to retire 457 two-wheeled carts which have been collecting household rubbish for the past 45 years. They currently gather 300 of the 1,200 tonnes of rubbish produced in the area on a daily basis.The carts will be replaced by motorized vehicles – a motorcycle and trailer with capacity for half a tonne of rubbish – in the next two months. The vehicles will move along at 30 kilometres (18 miles) per hour. (Photo by Henry Romero/Reuters)

Garbage collectors, with their horse and cart, collect rubbish in Nezahualcoyotl, on the outskirts of Mexico City, February 18, 2015. (Photo by Henry Romero/Reuters)

A garbage collector, with his horse and cart, prepares to unload rubbish at the municipal dump in Nezahualcoyotl, on the outskirts of Mexico City, February 18, 2015. (Photo by Henry Romero/Reuters)

A garbage collector rides his horses and cart in Nezahualcoyotl, on the outskirts of Mexico City, February 18, 2015. (Photo by Henry Romero/Reuters)

A garbage collector rides his horses and cart into the municipal dump in Nezahualcoyotl, on the outskirts of Mexico City, February 18, 2015. (Photo by Henry Romero/Reuters)

A child, holding a puppy, sits with garbage collectors as they separate organic from non-organic trash, at the municipal dump in Nezahualcoyotl, on the outskirts of Mexico City, February 18, 2015. (Photo by Henry Romero/Reuters)

A garbage collector rides his horse-drawn rubbish cart, with his family, in Nezahualcoyotl, on the outskirts of Mexico City, February 18, 2015. (Photo by Henry Romero/Reuters)

A garbage collector rings his bell, beside his horse-drawn rubbish cart, in Nezahualcoyotl, on the outskirts of Mexico City, February 18, 2015. (Photo by Henry Romero/Reuters)

Horses rest next to their rubbish carts at the municipal dump in Nezahualcoyotl, on the outskirts of Mexico City, February 18, 2015. (Photo by Henry Romero/Reuters)

Garbage collectors let their horse drink, before unloading rubbish from their cart, at the municipal dump in Nezahualcoyotl, on the outskirts of Mexico City, February 18, 2015. (Photo by Henry Romero/Reuters)