Green technology is a broad category that encompasses several forms of environmental remediation. While climate change and carbon emissions are now considered among the most pressing global issues, there are also many efforts to address local environmental hazards. Some seek to protect specific ecosystems or endangered species. Others seek to conserve scarce natural resources by finding more sustainable alternatives.
https://www.investopedia.com/terms/g/green_tech.asp
Is Nuclear Power Green?
Nuclear power is a deeply controversial subject, and many scientists have disputed its benefits. Although nuclear power derived from fission can provide reliable, inexpensive electricity without greenhouse gases, it also produces highly radioactive waste that must be stored for thousands of years. Some activists have argued that nuclear power can never be safely generated, and a number of high-profile accidents—notably at Chernobyl and Fukushima—have highlighted these concerns. However, it should also be noted that the combined death toll from nuclear accidents is far lower than the annual fatalities from fossil fuel pollution.14
Suggested Readings :
https://www.greentechnologyinfo.com/environmental-technology/green-technology/
https://www.nature.com/collections/igjfijfdba/
The emergence of electric mobility has placed high demands on lithium-ion batteries, inevitably requiring a substantial consumption of transition-metal resources. The use of this resource raises concerns about the limited supply of transition metals along with the associated environmental footprint. Organic rechargeable batteries, which are transition-metal-free, eco-friendly and cost-effective, are promising alternatives to current lithium-ion batteries that could alleviate these mounting concerns. In this Review, we present an overview of the efforts to implement transition-metal-free organic materials as the redox-active component in diverse types of organic rechargeable batteries. In addition, we critically evaluate the current status of organic rechargeable batteries from a practical viewpoint and assess the feasibility of their use in various energy-storage applications with respect to environmental and economic aspects. We believe this Review provides a timely evaluation of organic rechargeable batteries from a real-world perspective, and we hope it will spur more intensive efforts towards a greener energy future.
https://www.thoughtco.com/introduction-to-green-technology-1991836
Green technology, also known as sustainable technology, takes into account the long- and short-term impact something has on the environment. Green products are by definition, environmentally friendly. Energy efficiency, recycling, health and safety concerns, renewable resources, and more all go into the making of a green product or technology.
The world has a fixed amount of natural resources, some of which have already been depleted or ruined. For example, household batteries and electronics often contain dangerous chemicals that pollute soil and groundwater with chemicals that cannot be removed from our drinking water supply and wind up in food crops and livestock grown on contaminated soil. The health risks alone are staggering.
There are three principles which define sustainability in any type of material, as described by the American ecologist and economist Herman Daly:
- Non-renewable resources should not be depleted at rates higher than the development rate of renewable substitutes.
- Renewable resources should not be exploited at a rate higher than their regeneration levels.
- The absorption and regeneration capacity of the natural environment should not be exceeded.
Non-renewable energy resources include nuclear, hydrogen, coal, natural gas, and oil. All of these currently fail the definition of sustainability in one way or another but most painfully in the ability of the environment to absorb and regenerate the expenses related to their extraction or production.
https://en.wikipedia.org/wiki/Environmental_technology
Vertical farming. https://earth.org/green-tech/
Last reflection :
While green technologies have the shared goal of preserving biodiversity and conserving the earth’s resources, there are few ways to do so without affecting the environment in other ways. In some cases, reducing environmental costs in one area means causing adverse impacts in another.
For example, the batteries in electric vehicles rely on lithium, an element that is often strip-mined from South American rain forests.10 Hydroelectric dams have low carbon emissions, but high impacts on the salmon and other species that rely on those waterways.11 Green energy devices such as solar panels and wind turbines require a host of rare minerals, that can only be extracted by diesel-powered mining machinery.12
This does not necessarily mean that green technology is a lost cause, but it does require careful accounting to ensure that the benefits outweigh the costs.
Following the war, scientists like Rachel Carson began warning of the consequences of chemical pesticides, while doctors abroad reported mysterious illnesses associated with nuclear radiation. Many point to this era as the genesis of the ecological movement, which sought to preserve ecosystems and resources while raising awareness of the consequences of runaway technology.https://www.investopedia.com/terms/g/green_tech.asp
Source : slideshared.net
UNIVERSE 
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