....according to a leading authority on global warming.
In an interview with The Times, Lord Stern of Brentford said:
“Meat is a wasteful use of water and creates a lot of greenhouse gases. It puts enormous pressure on the world’s resources. A vegetarian diet is better.”
Direct emissions of methane from cows and pigs is a significant source of greenhouse gases. Methane is 23 times more powerful than carbon dioxide as a global warming gas.
Lord Stern, the author of the influential 2006 Stern Review on the cost of tackling global warming, said that
a successful deal at the Climate Change Conference in Copenhagen in December would lead to soaring costs for meat and other foods that generate large quantities of greenhouse gases.
He predicted that people’s attitudes would evolve until meat eating became unacceptable. “I think it’s important that people think about what they are doing and that includes what they are eating,” he said. “I am 61 now and attitudes towards drinking and driving have changed radically since I was a student. People change their notion of what is responsible. They will increasingly ask about the carbon content of their food.”
Lord Stern, a former chief economist of the World Bank and now I. G. Patel Professor of Economics at the London School of Economics, warned that British taxpayers would need to contribute about £3 billion a year by 2015 to help poor countries to cope with the inevitable impact of climate change.
He also issued a clear message to President Obama that he must attend the meeting in Copenhagen in person in order for an effective deal to be reached. US leadership, he said, was “desperately needed” to secure a deal.
He said that he was deeply concerned that popular opinion had so far failed to grasp the scale of the changes needed to address climate change, or of the importance of the UN meeting in Copenhagen from December 7 to December 18. “I am not sure that people fully understand what we are talking about or the kind of changes that will be necessary,” he added.
Up to 20,000 delegates from 192 countries are due to attend the UN conference in the Danish capital. Its aim is to forge a deal to reduce greenhouse gas emissions sufficiently to prevent an increase in global temperatures of more than 2 degrees centigrade. Any increase above this level is expected to trigger runaway climate change, threatening the lives of hundreds of millions of people.
Lord Stern said that Copenhagen presented a unique opportunity for the world to break free from its
catastrophic 
current trajectory. He said that the world needed to agree to halve global greenhouse gas emissions by 2030 to 25 gigatonnes a year from the current level of 50 gigatonnes.
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