New breed of conservatives cast the promotion of efficient lights as an example of government interference

Safety and 'sense of security' the top priority, government says, as country faces power shortages at hottest time of year

Yellowstone river oil spill throws spotlight on ExxonMobil and regulators

UK climate secretary to tell defence experts that conflict caused by climate change risks reversing the progress of civilisation

Prime minister decrees that all air travel should be in economy seats as he tries to rescue government's green credentials

Internal emails seen by Guardian show PR campaign was launched to protect UK nuclear plans after tsunami in Japan

Sir David King, a former chief scientific adviser, writes in the Guardian to urge prime minister to fill 'leadership vacuum'

Thinktank says technologies reliant on water could be hampered by droughts – and production is faltering already

Leaked documents ahead of key Lima meeting suggest UN body is looking to slow emissions with technological fixes rather than talks

NEC's memory chip uses small magnets to retain data and can cut standby consumption to zero for electronics such as TVs