Environment has the most interesting engineering techniques which cannot be imagined to the humans. Although man made engineering harmful to the natural environment, environmental engineering helpful  to the live on the earth. Humanity has always engineered the environment around us. Water, air, forest, plants, animals and all the factors in natural environment consist with a great engineering.        

For an example, Lotus effect is a natural system which  refers to self-cleaning properties that are a result of ultrahydrophobicity as exhibited by the leaves of "lotusflower". Dirt particles are picked up by water droplets due to the micro- and nanoscopicarchitecture on the surface, which minimizes the droplet's adhesion to that surface.This technique has adopted by engineers as 'Nano Technology' for the development of mandkind.    

The beehive's internal structure is a densely packed group of hexagonalprismatic cells made of beeswax, called a honeycomb. The bees use the cells to store food (honey and pollen) and to house the brood (eggs, larvae, and pupae). Currently, engineers have revealed that this shape of bee hive structure caused to increase the strength and protection to the structure. Therefore, building structures which need much strength use the shape of beehive shape.     

The kingfisher is an incredibly effective hunter. It watches from a perch or while hovering above a pond until it sees a fish, and then it dives, slicing through the water with such speed and ease as if there were no barrier between it and its prey. It makes almost no splash thanks to the aerodynamic build of its bill and head. Engineers of the bullet train needed to quiet down the noise level of the train, which exceeded environmental standards. One source of noise was an atmospheric pressure wave forced in front of the train as it traveled through a narrow tunnel, creating a sonic boom at the exit. The bullet-shaped nose was part of the problem. So, the engineers turned toward nature and the kingfisher, focusing on how it manages to cut into the water with little drag. This shape pushes water out of the way, rather than ahead of the bird, and this is exactly what the engineers wanted to accomplish with their train. The engineers changed the shape of the train's nose to be more similar to that of the kingfisher. This was one of the main ways in which the team found success.

According to my point of view, environment has the nest engineering practices compairing with mankind. It is evidenced with no waste is generated in a natural forest although large number of animals and plants living in it. But the human engineering always leave some harmful effect to the environment as a result of their creations.