Obama administration under growing pressure to end support for corn ethanol as gas and food prices continue to rise

Network of more than 100 pylons serving wind farms in mid-Wales will travel through Vyrnwy valley

Earth's land shown to have warmed by 1.5C over past 250 years, with humans being almost entirely responsible

Nearly 400 military members sign letter insisting research on alternative fuels for military use is vital to national security

British officials talking to Chinese about plan that could see up to five reactors being built at cost of £35bn, sources say

Departure of permanent secretary raises questions about ministry plagued by policy U-turns and row with Treasury

The per capita emissions of the world's largest national emitter is almost on a par with the European average, new figures show

Experiment in New Mexico will try to establish the possibility of cooling the planet by dispersing sulphate aerosols

Scientists to march through Ottawa in white lab coats in protest at cuts to research and environmental damage

Sajid Javid, Osborne's parliamentary private secretary, is backing the Free Enterprise Group seeking extra runways