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Environmental issues

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bhawna dev

on 22 June 2014

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Transcript of Environmental issues

Genetic engineering
Nanotechnology
Nuclear bombs
Climate change
Climate change is a significant and lasting change in the statistical distribution of weather patterns over periods ranging from decades to millions of years. It may be a change in average weather conditions, or in the distribution of weather around the average conditions (i.e., more or fewer extreme weather events).
Environmental degradation
Environmental issues
list-
Environmental issues
Causes
Here is the list of environmental issues
Climate change
Environmental degradation
Environmental degradation
Eutrophication
Habitat destruction
Soda lake
Genetic engineering
Nanotechnology
Nuclear bombs
Invasive species
Genetic pollution
Genetically modified food controversies
Nanotoxicology
Nanopollution
Nanopollution is a generic name for all waste generated by nanodevices or during the nanomaterials manufacturing process. This kind of waste may be very dangerous because of its size.
On the broadest scale, the rate at which energy is received from the sun and the rate at which it is lost to space determine the equilibrium temperature and climate of Earth.
Factors that can shape climate are called climate forcings or "forcing mechanisms". These include processes such as variations in solar radiation, variations in the Earth's orbit, mountain-building and continental drift and changes in greenhouse gas concentrations.
Nanotechnology (sometimes shortened to "nanotech") is the manipulation of matter on an atomic, molecular, and supramolecular scale. The earliest, widespread description of nanotechnology referred to the particular technological goal of precisely manipulating atoms and molecules for fabrication of macroscale products, also now referred to as molecular nanotechnology.
Environmental degradation is the deterioration of the environment through depletion of resources such as air, water and soil; the destruction of ecosystems and the extinction of wildlife. It is defined as any change or disturbance to the environment perceived to be deleterious or undesirable.[1] As indicated by the I=PAT equation, environmental impact (I) or degradation is caused by the combination of an already very large and increasing human population (P), continually increasing economic growth or per capita affluence (A), and the application of resource depleting and polluting technology (T).
Environmental degradation
Eutrophication
Habitat destruction
Invasive species
Soda lake
A soda lake or alkaline lake is a lake on the strongly alkaline side of neutrality (in other words, a pH value above 7, typically between 9 - 12). They are characterized by high concentrations of carbonate salts, typically sodium carbonate (and related salt complexes), giving rise to their alkalinity. In addition, many soda lakes also contain high concentrations of sodium chloride and other dissolved salts, making them saline- or hypersaline lakes as well. High pH and salinity often coincide, because of how soda lakes develop (see "Geology, geochemistry and genesis").
genetic ingineering
Genetic pollution
Genetic pollution is a controversial[1][2] term for uncontrolled [3][4] gene flow into wild populations. This gene flow is undesirable according to some environmentalists and conservationists, including groups such as Greenpeace, TRAFFIC, and GeneWatch UK.
Genetically modified food controversies
Genetically modified food controversies
Health
The genetically modified foods controversy is a dispute over the use of foods and other goods derived from genetically modified crops instead of conventional crops, and other uses of genetic engineering in food production.
The dispute involves consumers, biotechnology companies, governmental regulators, non-governmental organizations, and scientists.
In 2006, the Pew Initiative on Food and Biotechnology made public a review of U.S. survey results from 2001-2006.[30] The review showed that Americans' knowledge of genetically modified foods and animals was low through the period.
Protests
Concern about gene flow drives some protesters. In May 2012, a group called "Take the Flour Back" led by Gerald Miles protested against plans by a group from Rothamsted Experimental Station, based in Harpenden, Hertfordshire, England, to stage an experimental trial to use genetically modified wheat to repel aphids. The researchers, led by John Pickett, wrote a letter to the group "Take the Flour Back" in early May 2012, asking them to call off their protest, aimed for 27 May 2012.
There is a widespread perception that eating food from genetically modified crops is more risky than eating food from conventionally farmed crops. However, there is broad scientific consensus that food on the market derived from such crops poses no greater risk than conventional food.
Nanotoxicology
Nanotoxicology is the study of the toxicity of nanomaterials. Because of quantum size effects and large surface area to volume ratio, nanomaterials have unique properties compared with their larger counterparts.
Nanopollution
Nanotechnology
The nuclear power debate is a controversy about the deployment and use of nuclear fission reactors to generate electricity from nuclear fuel for civilian purposes. The debate about nuclear power peaked during the 1970s and 1980s, when it "reached an intensity unprecedented in the history of technology controversies", in some countries.
nuclear issues
Nuclear weapon
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion. Both reactions release vast quantities of energy from relatively small amounts of matter. The first fission ("atomic") bomb test released the same amount of energy as approximately 20,000 tons of TNT.
Nuclear meltdown
Nuclear and radiation accidents and incidents
Nuclear fallout
Nuclear fallout, or simply fallout, also known as Black Rain, is the residual radioactive material propelled into the upper atmosphere following a nuclear blast or a nuclear reaction conducted in an unshielded facility, so called because it "falls out" of the sky after the explosion and shock wave have passed.
High-level radioactive waste management
Hannes Alfvén, Nobel laureate in physics, described the as yet unsolved dilemma of high-level radioactive waste management: "The problem is how to keep radioactive waste in storage until it decays after hundreds of thousands of years. The geologic deposit must be absolutely reliable as the quantities of poison are tremendous. It is very difficult to satisfy these requirements for the simple reason that we have had no practical experience with such a long term project. Moreover permanently guarded storage requires a society with unprecedented stability.
A Nuclear meltdown is an informal term for a severe nuclear reactor accident that results in core damage from overheating. The term is not officially defined by the International Atomic Energy Agency[2] or by the U.S. Nuclear Regulatory Commission.[3] However, it has been defined to mean the accidental melting of the core of a nuclear reactor,[4] and is in common usage a reference to the core's either complete or partial collapse. "Core melt accident" and "partial core melt"[5] are the analogous technical terms for a meltdown.
Curbing Global Warming
Climate change is the single biggest environmental and humanitarian crisis of our time. We must act now to spur the adoption of cleaner energy sources at home and abroad.
Creating the Clean Energy
Future
America's dependence on fossil fuels threatens our national security and is a major contributor to global warming and toxic air pollution. By investing in renewable energy sources such as the sun, wind and biomass, we can help solve the energy and climate crises.
Reviving the World's Oceans

The world's oceans are on the brink of ecological collapse. We can restore marine vitality by ending overfishing, creating marine protected areas and improving the way we govern our oceans.
Defending Endangered Wildlife and Wild Places
The destruction of our last remaining wildlands means the loss of vast troves of biological diversity, critical regulators of global climate, and irreplaceable sanctuaries.
Protecting Our Health By Preventing Pollution
We must reduce or eliminate the dangerous chemicals in the products we buy, the food we eat and the air we breathe.
Our Priority
what to do
Ensuring Safe and Sufficient Water
As we enter the 21st century, swelling demand and changing climate patterns are draining rivers and aquifers as pollution threatens the quality of what remains.
Fostering Sustainable Communities
The choices we make for where and how we live have enormous impacts on our well-being, economy, and natural environment. NRDC develops and advocates sustainable solutions for our communities.
By - Bhawna Dev
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