Many countries are investing in techniques of utilising CO2 for manufacturing processes – but UK is getting left behind. Passing carbon dioxide through slag left over from steel-making turns the waste product into a strong material that can be used for construction. Pumped into greenhouses, it provides a growing boost for crops. Put into tanks of algae, it can be used to make biofuels. Waste carbon dioxide can even be cleaned up to "food grade" and injected into fizzy drinks. Read more
Recycling
Mining the rubbish buried by previous generations for valuable commodities has been a dream: now it's becoming a reality. Read more
Retail giant accepts smaller tech goods including mobiles, satnavs and MP3 players, and promises to beat price offered by five other services. Read more
Local Government Association calls on retailers to change food promotions in an effort to cut amount heading to landfill. The analysis, which combined the price of food which was not eaten with the cost to council taxpayers of sending it to landfill, revealed that households paid an estimated £520 each for uneaten food over the past 12 months. Read more
Cheltenham food waste recycling scheme proves its worth