CO2

Wing attachments to save airline 7m litres of fuel annually, 19 per cent more than expected

iPhones and other mobile devices used to save energy by remotely controlling air conditioning and heaters

Proposed levies could generate $12.4bn in annual tax revenues

Experts predict that rapidly expanding cities mean CO2 emissions will peak no sooner than 2035

But new opposition party data suggests more modest carbon targets would lead to fractionally higher increases in income

Popular subsidy abruptly halted after nearly 2,000 schools exhaust funding

Government has drawn up secret plans to tax electricity consumers to subsidise new nuclear reactors, the Guardian has learned

IHI claims battery-powered vessel will cruise 120km on an eight-hour charge

Technology key to achieving 90 per cent cut in CO2 levels by 2020

The development of PAS 2060 is being supported by organisations including Marks & Spencer and Eurostar