Our studio guest this week is Claudia Kemfert, manager of the department of Energy, Transport and Environment at the the German Institute for Economic Research (DIW).   DW-TV: Let’s pull in Claudia Kemfert. She's head of Energy, Transport and Environment at the German Institute for Economic Research. Ms. Kemfert, what we've seen here, is this the answer to our energy problems? Should everyone make his or her house an energy plant? Claudia Kemfert: Well, it's one of the answers. It's especially efficient to produce electricity and heat in combination and for this I think it's a good opportunity to save energy and really to be independent from energy input. DW-TV:You say that every German needs to spend about a hundred and thirty euros a year to become CO2 neutral. Where does that money need to be spent? Claudia Kemfert: Well, this is the price on the stock exchange: 13 euros per tonne of CO2. You can donate this money, especially to a climate protection project, in developing countries for example. DW-TV: Is that more of a PR tactic to get people interested in reducing CO2 emissions? Claudia Kemfert: No, it's more than this, because on a global perspective it doesn't matter where you reduce emissions, it matters that you reduce emissions. For this it's OK just to donate some money in climate protection policies. DW-TV: Alright. Let's take a look at what the world's biggest economies are doing right now to go green. We've got a graphic we'd like to show you here and you can see China, South Korea, the United States, Germany, you can see how much they've actually spent as part of the economic stimulus packages that were passed in the last year and a half. It appears that the Chinese are upping the ante here when it comes to spending on green technology, but those numbers are tricky, aren't they? Claudia Kemfert: Well, they spent a lot of money, that's for sure. However, you have to see that they also spent on ...