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Seeing as people said £300-£500 for the loft, how much will cavity walls cost to insulate?

[quote author=allegrif link=topic=217.msg566#msg566 date=1449242957]
Roll on fusion though, that'll be far better if we ever crack it.
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Can't disagree there, at least the waste won't take 100 years to clear.

[quote author=JamesH link=topic=218.msg600#msg600 date=1449268179]
I doubt this will ever happen. Building a windfarm close to an airport is already cause for planning rejection, due to radar interferences. Building one on the runway itself would never happen.
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Surely having some sort of low Veritcal axis turbines wouldn't affect radar though, surely?

The larger they are the longer it takes. In the interim period the wind could pick up again. As long as the wind dow not drop below 8mph they will keep spinning, albeit at a reduced capacity.

Cost is by far the biggest factor. Especially up north, the difference in ROI is massive. Just 2-3 years soemtimes for heating panels, but often 15 years for PV.

Could India follow China's lead in creating a massive dam on their own national river, the Ganges?

I think it would help massive as India already does not meet current electricity demand, and the Ganges has a very large outflow.

I had this exact same idea, and also came to the conclusion that safety might be an issue. Remember that only half the energy is being used to push the plane forward, with the rest being used to push air back.

Eventually we may have to. But for now I think it's more efficient to reduce existing emmisions, as that technology is well established, and more efficient for the same cost.

I don't, because how ever small the risk per station is, we've seen far too many accidents. They were saying "oh chernobyl will never happen again in this day and age" then in 2011 Fukushima had a meltdown on par with chernobyl. So I have no faith in safety anymore, especially with the current terrorism threat,

For 100% I'd say probably 2050 as an absolute best case scenario. Europe could probably make it by 2035 at a push, but China has far too many coal stations already in the pipeline. So they aren't going to pull down stations the day they are built, 90% by 2040 is possible though.

I'm hoping the answer is free with subsidies, but I'm not sure if they even exist anymore, otherwise what would the cost be for an average 3 bed semi loft insulation?

Wind, because it's the cheapest and fastest thing we can do at the moment to reduce coal and gas consumption. Although in the long term more reliable sources of renewables will have to be invested in.

I connected a bike flywheel to an alternator but never found anything to power with it. I tried just hooking it up to a 40W, and blew it :/ I've never made any use of it.

I don't think most of these green walls are planned actually :P Just seems like the sort of thing that gradually happpens over time without anyone putting thought into it.

The silicon wafers are extremely light, so potentially very light, it's the plastic and other stuff that normally adds weights, but when built into a laptop it weighs almost nothing, and sometimes may even make an item weigh less.