Light-emitting diodes use less energy and last longer than even compact fluorescent lights.This article, written by Angela Spivey*, appeared first in Environmental Health...
Phosphor-Based White LEDs: Mixed Blessings?Last Updated on 2012-01-26 00:00:00
Light-emitting diodes use less energy and last longer than even compact fluorescent lights.This article, written by Angela Spivey*, appeared first in Environmental Health Perspectives—the peer-reviewed, open access journal of the National Institute of Environmental Health Sciences.
The article is a verbatim version of the original and is not available for edits or additions by Encyclopedia of Earth editors or authors. Companion articles on the same topic that are editable may exist within the Encyclopedia of Earth.
The Mixed Blessing of Phosphor-Based White LEDs
Light-emitting diodes (LEDs), which use less energy and last longer than even compact fluorescent lights,1 are predicted to become the leading lighting technology in the United States as incandescent bulbs are phased out.2 But Abraham Haim, director of the Israeli Center for Interdisciplinary Studies... More »
2012 International Year of Sustainable Energy for AllLast Updated on 2011-12-19 00:00:00
International Year of Sustainable Energy for All: 2012
On 16 February 2011, the General Assembly of the United Nations adopted a Resolution (A/RES/65/151) declaring Year 2012 to be the International Year of Sustainable Energy for All.
In that Resolution the General Assembly:
Decides to declare 2012 the International Year of Sustainable Energy for
Notes the efforts of the United Nations system to work towards ensuring
energy access for all and to protect the environment through the sustainable use of
traditional energy resources, cleaner technologies and newer energy sources;
Requests the Secretary-General, in consultation with relevant agencies
within the United Nations system and UN-Energy, and mindful of the provisions of
the annex to Economic and Social Council resolution 1980/67, to organize and
coordinate activities to be... More »
Molten Rock as a Source of High-Grade EnergyLast Updated on 2011-02-16 00:00:00
Iceland Volcano's Molten Rock Could
Become Source of High-Grade Energy
Krafla volcano gives geologists unique, unexpected opportunity to study magma
Geologists drilling an exploratory geothermal well in 2009 in the Krafla volcano in Iceland met with a big surprise: underground lava, also called magma, flowed into the well at 2.1 kilometers (6,900 feet) depth. It forced the scientists to stop drilling.
"To the best of our knowledge, only one previous instance has been documented of magma flowing into a geothermal well while drilling," said Wilfred Elders, a geologist at the University of California, Riverside, who led the research team.
Elders and his team studied the well within the Krafla caldera as part of the Iceland Deep Drilling Project, an industry-government consortium, to test whether geothermal fluids at supercritical pressures and... More »
Spiral Pine Needle CookstoveLast Updated on 2010-12-28 00:00:00
Spiral Pine Needle Cookstove
In Uttrakand, India, wood fuel is a scarce commodity, as it is illegal to cut branches from the government-owned pine trees. The large volume of needles fallen from these trees present environmental hazards and increase the risk of forest fires; however, these pine needles have great potential as a highly combustible alternative fuel.
How does it work: This cook stove uses unprocessed pine needles as an alternative fuel. The design incorporates a slow feed of compressed pine needles that burn and gasify in an insulated chamber. The resulting fire is directed along an innovative spiral geometry to increase the burn path of the fuel, thus allowing for a clean, efficient burn that spreads heat across the bottom of the pot. ... More »
IPCC Fourth Assessment Report, Working Group III: Chapter 6Last Updated on 2010-08-05 00:00:00
Originally published by our Content Partner: Intergovernmental Panel on Climate Change (other articles)
Residential and commercial buildings
Table of Contents
6.2 Trends in buildings sector emissions
6.3 Scenarios of carbon emissions resulting from energy use in buildings
6.4 GHG mitigation options in buildings and equipment
6.4.1 Overview of energy efficiency principles
6.4.2 Thermal envelope
6.4.3 Heating systems
6.4.4 Cooling and cooling loads
6.4.5 Heating, ventilation and air conditioning (HVAC) systems
6.4.6 Building energy management systems (BEMS)
6.4.7 Active collection and transformation of solar energy
6.4.8 Domestic hot water
6.4.9 Lighting systems
6.4.10... More »
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