Volkswagen has created what it calls the world's most economic car, running for 313 miles on a single gallon of diesel.
You can turn down the heating; you can switch to a hybrid car. But unless you can stop, um, we'd better call it excreting, your efforts won't go a long way towards cutting your carbon emissions.
A Californian company has filed a patent for a technology which it says allows CO2 and natural gas to be converted directly to gasoline.
Carbon capture and storage could be as risky and hard to manage as the storage of nuclear waste, according to a Danish scientist.
Carbon dioxide has been the main factor controlling global temperatures for millions of years, according to a new study.
Scientists think they've found the source of a huge carbon dioxide 'burp' which helped to end the last ice age 18,000 years ago.
The oceans are acidifying more quickly than at any time in hundreds of thousands of years, the National Research Council has reported to Congress.
UK researchers reckon they are on track to take carbon dioxide from the air and turn it into car fuel.
Ocean acidifcation is taking place at a faster rate than has been seen in the last 65 million years - and it's still accelerating.