Views:69791|Rating:4.64|View Time:3:33Minutes|Likes:235|Dislikes:18 While it’s true that Earth’s temperatures and carbon dioxide levels have always fluctuated, the reality is that humans’ greenhouse emissions since the industrial revolution have put us in uncharted territory.
Written by Dr Benjamin Henley and Assoc Prof Nerilie Abrams.
Animated and edited by Wes Mountain for The Conversation.
Music: Kevin Macleod – Faster Does It
Views:1263165|Rating:3.51|View Time:4:24Minutes|Likes:11428|Dislikes:4865 Is green energy, particularly wind and solar energy, the solution to our climate and energy problems? Or should we be relying on things like natural gas, nuclear energy, and even coal for our energy needs and environmental obligations? Alex Epstein of the Center for Industrial Progress explains.
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Are wind and solar power the answer to our energy needs? There’s a lot of sun and a lot of wind. They’re free. They’re clean. No CO2 emissions. So, what’s the problem?
Why do solar and wind combined provide less than 2% of the world’s energy?
To answer these questions, we need to understand what makes energy, or anything else for that matter, cheap and plentiful.
For something to be cheap and plentiful, every part of the process to produce it, including every input that goes into it, must be cheap and plentiful.
Yes, the sun is free. Yes, wind is free. But the process of turning sunlight and wind into useable energy on a mass scale is far from free. In fact, compared to the other sources of energy — fossil fuels, nuclear power, and hydroelectric power, solar and wind power are very expensive.
The basic problem is that sunlight and wind as energy sources are both weak (the more technical term is dilute) and unreliable (the more technical term is intermittent). It takes a lot of resources to collect and concentrate them, and even more resources to make them available on-demand. These are called the diluteness problem and the intermittency problem.
The diluteness problem is that, unlike coal or oil, the sun and the wind don’t deliver concentrated energy — which means you need a lot of additional materials to produce a unit of energy.
For solar power, such materials can include highly purified silicon, phosphorus, boron, and a dozen other complex compounds like titanium dioxide. All these materials have to be mined, refined and/or manufactured in order to make solar panels. Those industrial processes take a lot of energy.
For wind, needed materials include high-performance compounds for turbine blades and the rare-earth metal neodymium for lightweight, specialty magnets, as well as the steel and concrete necessary to build structures — thousands of them — as tall as skyscrapers.
And as big a problem as diluteness is, it’s nothing compared to the intermittency problem. This isn’t exactly a news flash, but the sun doesn’t shine all the time. And the wind doesn’t blow all the time. The only way for solar and wind to be truly useful would be if we could store them so that they would be available when we needed them. You can store oil in a tank. Where do you store solar or wind energy? No such mass-storage system exists. Which is why, in the entire world, there is not one real or proposed independent, freestanding solar or wind power plant. All of them require backup. And guess what the go-to back-up is: fossil fuel.
Here’s what solar and wind electricity look like in Germany, which is the world’s leader in “renewables”. The word erratic leaps to mind. Wind is constantly varying, sometimes disappearing completely. And solar produces little in the winter months when Germany most needs energy.
Views:332911|Rating:4.61|View Time:3:30Minutes|Likes:6523|Dislikes:546 Green energy is getting better and cheaper, yet we still largely rely on fossil fuels. Why haven’t we switched to solar and wind energy yet?
Which Countries Will Be Underwater Due To Climate Change? –
Which Countries Run On 100% Renewable Energy? –
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What Would Happen If We Burned All The Fossil Fuels On Earth?
“A new study published today in Science Advances finds that if we burn all of the remaining fossil fuels on Earth, almost all of the ice in Antarctica will melt, potentially causing sea levels to rise by as much as 200 feet–enough to drown most major cities in the world.”
Who’s Winning The Battle To Replace Coal?
“Coal is losing the battle for the electricity future in the United States. Investment in new coal-fired generating capacity has dried up with its share of electricity generation dropping from 53% in 2000 to 34% in 2015.”
Electricity in the United States
“In 2015, coal was used for about 33% of the 4 trillion kilowatthours of electricity generated in the United States. In addition to being burned to heat water for steam, natural gas can also be burned to produce hot combustion gases that pass directly through a natural gas turbine, spinning the turbine’s blades to generate electricity.”
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