A reality check on renewables - David Why is VENEZUELA a CATASTROPHY? - VisualPolitik EN 10 months ago   18:35

How much land mass would renewables need to power a nation like the UK? An entire country's worth. In this pragmatic talk, David MacKay tours the basic mathematics that show worrying limitations on our sustainable energy options and explains why we should pursue them anyway. (Filmed at TEDxWarwick.)

Lesson by David MacKay.

Comments 973 Comments

Irony A
The final solution is to drastically reduce the population, which funnily enough is the goal of the climate change agenda. Any volunteers ?
henrik kruse
Renewables can supply about 15% of the current demand. In 2100 the demand will be at least doubbled. AT LEAST!!
Why are the smart people, who are trying to make a positive, practical difference, the ones dying????
You probably should include the power consumption required from places like Australia to provide the sources for power consumption to other places. That would make a pretty big difference in what your saying...
Heather Viramontes Lopez
The bat is a new technology and is in the air, for crowded countries
Mountain Whale
I wish the audio wasn't so terrible, but the talk itself seems worth enduring it for.
Sanjay Maharaj
125kWh!!!! In my neighbourhood in ZA we use only 20kWh per day
semih oguzcan
We need degrowth. For this we need to get rid of capitalism and monetary system and adopt alternatives.
A Few things he didn't mention..

1.Storm Towers- There are several versions. but in the end they all simulate a hurricane. For power.

2. Bio Fuels.. There're several ways to skin that cat.

2a. huge tanks full of A Water solution with Algae.

2b. Hollow polls with plants growing on the walls.

2c. The Prior two will be far more expensive than people like..

this is far cheaper. Cannabis. Grows three meters in three months. That is a lot of biomass.

very fast.
John Cottis
Population density isn’t very meaningful. Canada, Australia and Russia have comparatively large areas of uninhabitable land, like the Arctic and the deserts. Similarly areas in Africa. It’s not comparing apples to apples to include that area, just as we don’t include Antarctica.
Aqua Vitae
#LTR Liquid Thorium Reactors.
Gordy Bishop
Does this guy not know of examples in his own area like was shown on Fully Charged years ago and doing better even today?

His back of envelope is far from accurate
The issue I see with bio-fuels is that plants require CO2, so it will be a catch 22 when our parts per million will get too low. So a balance of fossil fuel use and bio fuel. Unfortunately, energy cannot be created nor destroyed, so on the energy issues, we will be robbing Peter to pay Paul. We still need an x amount of CO2. Lack of CO2 was the cause of some Ice Age....I am not knocking the use of bio energy, just make sure we address that to the public about going back and forth...Great video
David Cuthbertson
This is the chicken little story in person
Fla-bushcraft Prepper
All three of the renewable he likes is killing the planet.
#1 Wind Generators are very toxic to make. Also they kill millions of flying species every year around the world. Also the batteries in the homes and city facilities are very toxic to make.
#2 The Solar Power Plants incinerate millions of flying species each year around the world. Also they are very toxic to make. I am not kidding. If you research Toxic Renewable Solar and Wind, you would be sickened at the toxic lakes at those facilities.
#3 Nuclear. What can I say? Fukashima is sill polluting the Pacific Ocean to this day in 2019. Given the rate of Nuclear incidents and the fact that humans have detonated over 2,000 nuclear bombs on earth to see what they do, it is not sane to consider nuclear Power Plants. The waste is extremely toxic.
The fact is Human Science is destroying the earth.
just live as peaceful as you can and teach others to love one another.

If you can afford to cut back then do so. If you can plant a tree or clean up the waters or lands some, then do so. Humans are destroying the earth and time for it expired long ago when a human decided to pick up a stone and kill his brother. So do not be like those type humans. Show love and tolerance to your ENEMIES but do not let them corrupt you into the ways of the world.
Wilbert Robichaud
Astronomy is a science; astrology is a pseudoscience.
Evolution is science; creationism is pseudoscience.
Molecular biology is science; homeopathy is pseudoscience.
Vaccination is science; the MMR scare is pseudoscience.
Oxygen is science; phlogiston was pseudoscience.
CO2 a trace gas is science;CO2 is carbon is pseudo science
Chemistry is science; alchemy was pseudoscience.
Climate change is science;antropogenic climate change is pseudoscience .
CO2 is an atmospheric gas is science ;CO2 is a pollutant is pseudoscience.
Mel Royale
once you put stuff into numbers then we can drop our opinions. If 28 mill cars in the UK were replaced by electric cars at £27,000 each, total would be £760 billion. To power this number of cars covering peak flows, we would need 60GW of extra power. Draz power station produces 4GW. So thats 15 more Drax power stations, at £20 bill each. So this is £1100 bill, when UK military budget is £44 Bill per year.I love numbers
valdis teivans
Just restrict the amount of children per couple (birth rates control) just like what China did, which is a rather good idea
Pip Santos
But activists want to power society with pixie dust. Free with no side effects.
Hope Young
Renewables are better termed unreliables. Considering the carbon used in making and maintaining wind turbines exceeds its output.
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Why is VENEZUELA a CATASTROPHY? - VisualPolitik EN A reality check on renewables - David 10 months ago   09:40

It wasn’t so long ago that Venezuela was the wealthiest nation in the entire of South America. Today, half of their population lives in extreme poverty. So, the question is… How did they end up there? What did their government do so wrong to destroy an economy in so little time? Today, we are gonna tell you the story.

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