About
Questions
Questions (24)
Environmental Science problems in space colonisation soil chemistry problems notably chlorides will need to be solved to make mars a viable place for life to thrive. the scale of proposed colonies will dramatically affect the ideal format of Environmental Science solutions to space colonisation life support problems. the smaller the party the more mechanical/chemical process will be best. if however larger colonies are present phytoremediation, hydroponic mining, production of Bioproducts, such as, Biopolymers, Biofuels, fiber, waxes, oils, resins, and solvents become more attractive. identifying the population levels required to change the balance from imported to in situ will be an important task. with the SpaceX proposal of one million colonists some of these tipping points will surely be reached.
of places where man mad canals exist, have fry been released, and to what result.
Cichorium intybus var. sativum or common chicory grows wild in many areas of the world. hyperaccumulators are plants that are known to accumulate toxic metal during there life cycle. foraging of wild plants presents a health risk if the plant is a hyperaccumulator. hyperaccumulators may be safe to eat in one location but hazardous to eat in an area with different soil chemistry.
Crumb rubber is recycled rubber produced from automotive and truck scrap tires. During the recycling process, steel and tire cord (fluff) are removed, leaving tire rubber with a granular consistency. Continued processing with a granulator or cracker mill, possibly with the aid of cryogenics or by mechanical means, reduces the size of the particles further. The particles are sized and classified based on various criteria including color (black only or black and white). The granulate is sized by passing through a screen, the size based on a dimension (1/4 inch) or mesh (holes per inch : 10, 20, etc.). Crumb rubber is often used in astroturf as cushioning, where it is sometimes referred to as astro-dirt.
Mesh refers to material that has been sized by passing through a screen with a given number of holes per inch. For example, 10 mesh crumb rubber has passed through a screen with 10 holes per inch resulting in rubber granulate that is slightly less than 1/10 of an inch. The exact size will depend on the size of wire used in the screen.
entering antinatalism or natalism into a search engine and one will find an extensive list of antinatalist position. there is obvious antinatalist bias in academia. antinatalist policies are proving to be very damaging to society. more studies are needed to clarify the difference between antinatalism, and natalism.
One-child policy, official program initiated in the late 1970s and early ’80s by the central government of China, the purpose of which was to limit the great majority of family units in the country to one child each. The rationale for implementing the policy was to reduce the growth rate of China’s enormous population. It was announced in late 2015 that the program was to end in early 2016.Kenneth Pletcher Former Encyclopædia Britannica Editor