鈥淭here is a wrong way and a right way to approach reducing greenhouse gas emissions.鈥�
George W. Bush explains why he is opposing a Senate measure that would place mandatory limits on greenhouse gases beginning in five years, followed by annual reductions (Associated Press, 18 April)
鈥淧rimitive life is very common and intelligent life is fairly rare. Some would say it has yet to occur on Earth.鈥�
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Stephen Hawking outlines his views on the possibility of intelligent life elsewhere in the universe during a lecture in Washington DC to mark NASA鈥檚 50th anniversary (Associated Press, 21 April)
鈥淗ow important is life and how important are cars? I say life first and cars second.鈥�
At a conference in London, Bolivian president Evo Morales criticises the growing of biofuels in place of food crops in South America (The Guardian, London, 22 April)
鈥淚 remember saying I would be much more comfortable promoting eating roadkill.鈥�
Lisa Lange, vice-president of People for the Ethical Treatment of Animals, on the controversy within the organisation generated by its $1 million prize for devising a commercially viable way of producing artificial meat (The New York Times, 21 April)
鈥淲e can confidently say it has influenced and shaped world events, and the Nighthawk can rest knowing its mission is complete.鈥�
US air force colonel Jeff Harrigian, commenting on the official retirement of the four remaining F-117 stealth fighter planes, which made their final operational flight on Monday (Alamogordo Daily News, New Mexico, 22 April)