More from Helen Knight
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Technology
New plastic recipe thwarts interfering old bags
News
Earth
Green machine: Tackling the plastic menace
News
Environment
Green machine: Bacteria will keep CO2 safely buried
News
Earth
Second well on the way to cap Deepwater Horizon
News
Earth
Green machine: Recycled batteries boost electric cars
News
Earth
Wonderfuel: Welcome to the age of unconventional gas
Features
Earth
Green machine: It’s your eco-friendly funeral
News
Earth
Green machine: Cars could run on sunlight and CO2
News
Earth
Sailing ships could harvest fuel from the oceans
News
Earth
Biofuels learn to eat less
News
Earth
Green machine: Hitting the lights in wasteful offices
News
Earth
Green machine: Cementing greener construction
News