Energy & Green Tech

U.S. energy use rises to highest level ever

Americans used more energy in 2018 than in any other year, according to the most recent energy flow charts released by Lawrence Livermore National Laboratory (LLNL). Overall total energy consumption rose to 101.2 quadrillion ...

Consumer & Gadgets

Researchers find ways to hackproof smart meters

Smart electricity meters are useful because they allow energy utilities to efficiently track energy use and allocate energy production. But because they're connected to a grid, they can also serve as back doors for malicious ...

Energy & Green Tech

How buildings can cut 80% of their carbon emissions by 2050

Energy use in buildings—from heating and cooling your home to keeping the lights on in the office—is responsible for over one-third of all carbon dioxide (CO2) emissions in the United States. Slashing building CO2 emissions ...

Robotics

New energy-efficient algorithm keeps UAV swarms helping longer

A new energy-efficient data routing algorithm developed by an international team could keep unmanned aerial vehicle swarms flying—and helping—longer, report an international team of researchers this month in the journal ...

Energy & Green Tech

Harnessing sunlight to pull hydrogen from wastewater

Hydrogen is a critical component in the manufacture of thousands of common products from plastic to fertilizers, but producing pure hydrogen is expensive and energy intensive. Now, a research team at Princeton University ...

Energy & Green Tech

Why don't we have electric aircraft?

Electric cars, trains, trams and boats already exist. That logically leads to the question: why are we not seeing large electric aircraft? And will we see them any time soon?

Internet

The environmental cost of cryptocurrency mines

Bitcoin, Ethereum, Litecoin and Monero—the names of digital-based cryptocurrencies are being heard more and more frequently. But despite having no physical representation, could these new methods of exchange actually be ...

Hardware

Huawei debuts latest advanced chipset for smartphone

Chinese tech giant Huawei unveiled its latest advanced chipset Friday ahead of the upcoming launch of its latest flagship smartphone, even as uncertainty hangs over whether the device can use Google's Android.

Engineering

The future of 'extremely' energy-efficient circuits

Data centers are processing data and dispensing the results at astonishing rates, and such robust systems require a significant amount of energy—so much energy, in fact, that information communication technology is projected ...

Software

Software helps planners design walkable cities

Walkable cities reduce traffic congestion, which causes around 3.3 million deaths and $121 billion in economic losses every year. But when architects are developing pedestrian-friendly neighborhoods, they often rely on trial ...

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World energy resources and consumption

In 2005, total worldwide energy consumption was 500 Exajoules (= 5 x 1020 J) with 80-90% derived from the combustion of fossil fuels. This is equivalent to an average energy consumption rate of 16 TW (= 1.585 x 1013 W). Not all of the world's economies track their energy consumption with the same rigor, and the exact energy content of a barrel of oil or a ton of coal will vary with quality.

Most of the world's energy resources are from the sun's rays hitting earth - some of that energy has been preserved as fossil energy, some is directly or indirectly usable e.g. via wind, hydro or wave power. The term solar constant is the amount of incoming solar electromagnetic radiation per unit area, measured on the outer surface of Earth's atmosphere, in a plane perpendicular to the rays. The solar constant includes all types of solar radiation, not just visible light. It is measured by satellite to be roughly 1366 watts per square meter, though it fluctuates by about 6.9% during a year - from 1412 W/m2 in early January to 1321 W/m2 in early July, due to the Earth's varying distance from the sun, and by a few parts per thousand from day to day. For the whole Earth, with a cross section of 127,400,000 km², the total energy rate is 1.740×1017 W, plus or minus 3.5%. This 174 PW is the total rate of solar energy received by the planet; about half, 89 PW, reaches the Earth's surface.

The estimates of remaining worldwide energy resources vary, with the remaining fossil fuels totaling an estimated 0.4 YJ (1 YJ = 1024J) and the available nuclear fuel such as uranium exceeding 2.5 YJ. Fossil fuels range from 0.6-3 YJ if estimates of reserves of methane clathrates are accurate and become technically extractable. Mostly thanks to the Sun, the world also has a renewable usable energy flux that exceeds 120 PW (8,000 times 2004 total usage), or 3.8 YJ/yr, dwarfing all non-renewable resources.

This text uses material from Wikipedia, licensed under CC BY-SA