The designs principles are Thermal & Solar Heating and Cooling, Solar & Wind Electricity, Contained Sewage Treatment,Building with Natural & Recycled Materials, Water Harvesting and Food Production. They are a bit expensive such as the plans of the house such as the plans of the house they sell you and solar panels but with the passage of time they are cheap because they reduce the bills. 

Materials that can be used are broken concrete and rocks, core samples or firewood, wooden cutoffs,tires or five-gallon plastic buckets, adobe and cob, among others.

An example is The Boot House, it is a house that looks like a shoe and is made of wood. This house is in Texas. 

The deforestation are based in the indiscriminate and irresponsible felling of trees and other types of plant species from forests and jungles, reaching worrying levels.When the people cut down trees we have less oxygen and affect vegetables and animals in extinction because these places are their homes. The solutions of this problem are to conserve the forests and use them rationally, without destroying the most valuable species and allowing them to regenerate with their own seeds and recycle the paper or reduce its consumption.

Extinction is the disappearance of all members of a species. The principal causes are demographic and genetic phenomena, genetic contamination, degradation of the habitat; predation and global warming. The possible solutions are to reduce pollutants discharged into air, land and water; reduce forest clearance, have respect for the animals and plants that surround us.