Oklahoma tornado: how did it form and why was it so deadly?

Briefing Tue 21 May, AT 16:07

Twister was a category four storm that struck the suburb of Moore with just five minutes' warning

Obama pledges economic revival and gun control in union address

Talking Point Wed 13 Feb, AT 12:59

The US President's 'wide-ranging' State of the Union address sets out a bold vision for his second term

Obama: first president to use word 'gay' in inaugural address

First Reaction Tue 22 Jan, AT 10:48

President makes gay rights paramount as many welcome surprisingly liberal second-term agenda

Gun control, immigration top Obama's second term agenda

Summary Mon 21 Jan, AT 15:53

Four challenges for Obama when he returns to the Oval Office after today's inauguration celebrations

Will hottest year ever force US to confront climate change?

Talking Point Wed 9 Jan, AT 11:44

Scientists hope 2012's record-breaking heat will drive climate change onto the political agenda

Climate change on the agenda as Bloomberg backs Obama

First Reaction Fri 2 Nov, AT 09:12

New York mayor Michael Bloomberg throws his weight behind the President. Will it make a difference?

Mole

Tory swing to right: it's enough to make a Lib Dem have kittens

Wed 5 Sep, AT 11:51 The Mole

Heathrow unguarded, a climate change sceptic at Environment and a green belt sceptic at Planning

Sudden Greenland ice sheet melt: is this climate change?

First Reaction Wed 25 Jul, AT 15:39

Nearly all of Greenland's ice sheet began to melt for a few days in July. Is climate change to blame?

Nasa image shows giant iceberg breaking off Greenland glacier

One-Minute Read Thu 19 Jul, AT 12:26

Petermann Glacier calves a second iceberg in two years, raising concerns at the rapid pace of ice loss

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