Skip to 0 minutes and 14 secondsSo we've arrived at session eight of the course. This is the final session. So I thought we'd do things a bit differently. Several of my academic colleagues are still here. And they're out in the garden having a bit of a barbecue. I'm not going to go out and join them.

Skip to 0 minutes and 41 secondsGosh, hello, Mike. You appear to have three stoves on the go, do you? Yes, I've got three stoves. I've got two rocket stoves and one fireless cooker, fuelless cooker. Could you tell me a bit about them please? The ones here and then the one at the end are rocket stoves. They're used by people in many developing countries. And they're more efficient than cooking on an open fire, a three-stone fire. An open fire might be 5%-10% efficient. These are maybe 20%, 30% percent efficient. They work, you can see here, feed in the wood at the bottom here. And then you feed it into the stove there.

Skip to 1 minute and 23 secondsThis time, we've put a hot plate on it so we can cook off some food at like a barbecue. The one at the end is even more simple. It's just a pipe with some fins going up it to keep the stove stable and to keep the cook pot on top stable there as well. And again, that's a nice way of-- And what are you cooking on top of that one? Well, come and have a look.

Skip to 1 minute and 50 secondsSo in this one, I've got some vegetable chilli with some lentils, some locally-sourced vegetables from the co-op there. And then this one? And this one, this is my fireless cooker. So the idea is if you're cooking something like rice, you can bring it up to the boil. And then all it really needs to do is simmer to cook. So rather than leaving it on a stove, or if you're at home leaving it on your gas hob, you can put it in a cooker like this one. So here we have a cardboard box. I've got an old cushion pad on the top. There's my pan of rice. We've actually cooked it already. So it's just keeping warm.

Skip to 2 minutes and 28 secondsYou can see the heat rising off it there. And I'll take the rest out so you can see what's in it. So we've got an old shirt there just to keep the newspaper off. We've got some shredded paper there to provide some thermal insulation so the rice will keep nice and warm and ready to eat. So it's not that this one doesn't need any energy, it just reduces the need for energy. That's right. So you just get it cooked on your stove, or your bring it up to temperature. And then you finish off the cooking by putting it in this nicely insulated box there. Well, thanks, Mike. I hope the food tastes good, too.

Skip to 3 minutes and 5 secondsI'm going to go and have a word with Pete.

'Three-stoves' Mike

What better way to get academics talking about sustainability than over a free lunch – but is there any such thing? Join Mike Clifford as he explains the principles behind his energy-efficient cooking devices. Those of you in China can also view this video on our Tudou channel.

Think about: If you use gas or electricity to cook with, are there ways in which you can reduce the amount of energy you use?

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This video is from the free online course:

Sustainability, Society and You

The University of Nottingham