A reality check on renewables - David Why is VENEZUELA a CATASTROPHY? - VisualPolitik EN 4 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

Lightning Rod
biofuels are NOT even close to being green or transformational, Solar is, Wind is, i am sure this guy is smart, but he has no vision and is back of enveloping a legacy technology. Dont be fooled
We can build houses that are much much, much more energy efficient. A passiv house is a German concept, these houses can be build without a significant source of heat (well, a hair blower). https://passivehouse.com/ A passiv house uses less than 15 kWh / m2 per YEAR instead of 6 kWh per day per degree celcius. That is an insane difference. You can also upgrade your house to passivhouse standard by renovation.
Ian Macdonald
The worldwide figures paint an even bleaker picture. Currently $250 billion a year is being spent on renewables, mostly wind and solar. Over $200 billion for the past decade. The result; at most 2% of world energy transitioned, probably more like 1%.

I think David MacKay was telling us this, but was afraid to say it directly in case of offending the Faithful who explicitly believe all the advertising hype put out by the wind turbine industry.

Chiranjeeb Jena
In 80's, computers were the size of a room but much less powerful than an average smartphone of today. Just imagine, someone gave a TED talk in 80's. He would have said, We can't run simulations becz the computer will take half of a city.

This TED talk is just like that. It presumes the technology will not improve. Solar cells are more efficient than 2013. We have crossed 20W/m2 efficiency and the solar panels are becoming cheaper too.

If my argument is flawed, please provide a counter argument in the comments. [PEACE]
Since he his dead, which is sad, he saved 125kWh/d or he reduced 100% of energyconsumption per person a yr. this is a remarkable result. In the same time the kardashian clan burned half the planet by showing their meaningless live in fuckbook and all the other useless medias that influences the young generation all around the world.
Dominic Barber
Wow - a sane person, talking sense without an agenda. Amazing.
Alexandre MacKay
He is my uncle. So sad he passed away.
Chippy Steve
Awful sound quality.Virtually unwatchable.Someone is really taking the hiss! Is there another recording of this lecture somewhere?
James Robert Coyle
Next is Molten Salt Fluid Fuel Thorium Breeder Reactors.
Rolf Schneider
Tidal waves power generation
Gary Baxter
David you have too many generalizations, on the amount of energy produced from renew able sources and how efficiently they are used. You don't say what fuels you base your calculations from. I'm sure there are biomass sources and ways of utilizing them that could deliver what you want.The problem is, main stream media is oblivious to these alternatives.
Kai Alive
Australia should use the unusable/unliveable desert as solar farms
The population problem is easy to fix. First, get a world government, sort of like an EU on steroids. Second, hold a world wide lottery and every fourth person gets to live; the rest are exterminated. Problem solved. Do you really think someone isn't really thinking about this idea? Never allow a world wide government. The UN is bad enough. It just doesn't have the military power to execute their plans.
This guy is spart and keeps it simple, although the desert option would probably require three more array farms, at least, to make up for the power loss of transporting electricity through cables from the Sahara to the UK... so..... not so good. He knows, and it is as plain as day, that the most significant answer or weighted option, is Nuclear. Just get rid of the freaking terrorists and a few other factors, such as deficient/sub standard construction materials and poor location selection.
who the FKKKK is Ted... Why should we follow TED?
gray man
they " peaked " because of politics ... not because they ran out.
Un Believer
And what is the UK doing? Importing about 250,000 people every year from Africa and the middle-east. We are a small island behaving like Canada.
You should be embarrassed about not knowing how much energy you use....... I don't need a smart meter to tell me what uses most electricity in my house....what we need is children to be better educated in these topics.
Gerard Vaughan
The learned professor has evidently no actual experience of Solar PV. My 3m^2 array provides around Four Hundred watts on a cold blue sky day. This is measured fact, and it makes Tea, and cooks, with a little help from me.
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Why is VENEZUELA a CATASTROPHY? - VisualPolitik EN A reality check on renewables - David 4 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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