Energy & Green Tech

Sustainable biodiesel from neem tree trans-esterification

The neem tree, Azadirachta indica, also known as the Indian Lilac, is well known for its oil extracted from its seed and fruit. It has been used in traditional medicine but has also been investigated for the pest control ...

Energy & Green Tech

Benefits of renewable energy vary from place to place

A new study from North Carolina State University finds that the environmental benefits of renewable power generation vary significantly, depending on the nature of the conventional power generation that the renewable energy ...

Energy & Green Tech

The motivation for sustainable aviation fuels

Global air travel consumes more than 100 billion gallons of jet fuel annually. That's expected to more than double by 2025 to 230 billion gallons. Despite the current pandemic, these projections reflect future anticipated ...

Engineering

Virgin's Hyperloop carries passengers for the first time

The Virgin Hyperloop made its first journey carrying passengers Sunday, in a test the company claimed represented a major step forward for the "groundbreaking" technology capable of transporting people at 1,000 kilometers ...

Energy & Green Tech

Powering toward a zero-carbon energy system

Can tomorrow's energy supply be freed of CO2 Fraunhofer researchers want to answer that question with a consortium of partners in ZO.RRO, a joint project underway in the German state of Thuringia. They are developing a complex ...

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Greenhouse gas

Greenhouse gases are gases in an atmosphere that absorb and emit radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. Common greenhouse gases in the Earth's atmosphere include water vapor, carbon dioxide, methane, nitrous oxide, and ozone. In our solar system, the atmospheres of Venus, Mars and Titan also contain gases that cause greenhouse effects. Greenhouse gases greatly affect the temperature of the Earth; without them, Earth's surface would be on average about 33°C (59°F) colder than at present.

Human activities since the start of the industrial era around 1750 have increased the levels of greenhouse gases in the atmosphere. The 2007 assessment report compiled by the IPCC observed that "changes in atmospheric concentrations of greenhouse gases and aerosols, land cover and solar radiation alter the energy balance of the climate system", and concluded that "increases in anthropogenic greenhouse gas concentrations is very likely to have caused most of the increases in global average temperatures since the mid-20th century".

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