We need to eat less meat - and the G8 should say so

Instead of feeding starving humans, we funnel huge amounts of crops through the animals we use for food. G8 leaders must call for change at next week's summit.

In Davos this April, David Cameron outlined his priorities for the UK's presidency of the G8 this year. He talked about advancing trade, ensuring tax compliance and promoting greater transparency, all with the goal of creating "lasting global prosperity". It's a noble goal – lifting people out of poverty and making corporations accountable for their actions. It's reassuring to see these issues receive international attention.

But there is one obvious issue that is not being talked about, which should be at the top of the G8 agenda: animal agriculture and its contribution to world hunger, environmental degradation and skyrocketing healthcare costs, all of which affect the global economy.

There is more than enough food being grown around the world to feed the entire human population. So why are more than a billion people going hungry? Because instead of feeding starving humans, we funnel huge amounts of crops through the animals we use for food. It takes up to 16 pounds of grain to produce just 1 pound of meat. And an astounding 97 per cent of the world's soya crop goes to farmed animals rather than to hungry people.

We could eliminate the worst cases of world hunger with about 40 million tonnes of food. And it would be easy enough to find: nearly 20 times that amount of grain, 760 million tonnes, is fed to animals on factory farms every single year. Compare this to biofuels, which account for only 100 million tonnes. Tens of thousands of people marched in London on Saturday in support of Enough Food IF, a laudable campaign which highlights biofuels as one of the "bad guys" in the fight to end global hunger – and yet, inexplicably, it doesn't have animal agriculture as one of its key themes.

By cutting our meat consumption and slowing the rate at which animals are bred, we could redirect the crops that they would have consumed to the people who need them most. That's why the prestigious Worldwatch Institute maintains that "[m]eat consumption is an inefficient use of grain – the grain is used more efficiently when consumed directly by humans. Continued growth in meat output is dependent on feeding grain to animals, creating competition for grain between affluent meat-eaters and the world's poor". Therefore, raising animals for meat creates a disturbing social-justice issue.

And as meat-based diets spread to developing countries, subsistence farmers are being driven off their land. Efficient, plant-based agricultural models are being replaced by intensive animal agriculture, which also pollutes the air and water and leads to desertification that renders the once-fertile land barren.

The United Nations reports that the meat industry is "one of the top two or three most significant contributors to the most serious environmental problems, at every scale from local to global". And it's easy to see why. Carbon dioxide, methane and nitrous oxide are the principal agents of climate change – and raising animals for food is one of the largest sources of carbon dioxide and the largest source of both methane and nitrous-oxide emissions. When you add up all the energy-intensive stages of raising animals for food, slaughtering them and processing and storing their flesh, it's clear why producing 1 calorie of animal protein requires more than 11 times as much fossil fuel as producing 1 calorie of plant protein. In addition, Greenpeace estimates that in a single crop season, more than 2.9 million acres of the Amazon rain forest in Brazil are destroyed to make more room to grow crops to feed farmed animals.

The water footprint of the livestock sector is also huge. It takes more than 2,400 gallons of water to produce 1 pound of meat, while growing 1 pound of wheat requires only 25 gallons. You save more water by not eating a pound of meat than you do by not showering for six months!

Not surprisingly, the United Nations Environment Programme concluded  that "[a] substantial reduction of impacts would only be possible with a substantial worldwide diet change, away from animal products".

Environmental issues, in turn, have a serious impact on our economy. Heat waves, droughts, rising sea levels and other problems caused by climate change can ruin crops and result in increased food prices. Major storms, a developing trend that scientists have also linked to environmental destruction, often do billions of pounds in damage. Sir Nicholas Stern, author of the government-commissioned review on climate change, which has been the reference work for politicians and journalists throughout the last 10 years, warns that if we do not reduce greenhouse-gas emissions, it will take less than 40 years for climate change to cause up to a 20 per cent drop in the world's gross domestic product. He fears that it could be "market failure on the greatest scale the world has seen".

Then there are the skyrocketing healthcare costs that are attributable in large part to the increase in human consumption of meat, eggs and dairy products. Loaded with artery-clogging cholesterol and saturated fat, these products have been linked to cancer, heart attacks, strokes, diabetes and obesity. These top killers burden the National Health Service and necessitate that billions of pounds be spent searching for cures and medications to relieve disease symptoms. They also claim a huge number of lives.

Aside from their environmental and health impacts, the meat, dairy and egg industries cause immense suffering to more than a billion animals every year in the UK alone, most of whom spend their entire lives crammed inside dark, filthy sheds. They don't get to breathe fresh air until they are on their way to the abattoir, where many have their throats slit while they are still conscious.

"Lasting global prosperity" can be attained only through sustainable growth – otherwise, we will simply compound current environmental and economic problems. World leaders at the G8 Summit must take into account the devastating impact of animal agriculture in order to encourage global food changes that will be the catalyst for such growth.

The UN reports that the meat industry is "one of the top two or three most significant contributors to the most serious environmental problems". Photograph: Getty Images.

Kerry McCarthy is the Labour MP for Bristol East and the shadow foreign minister.

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The deafening killer - why noise will be the next great pollution scandal

A growing body of evidence shows that noise can have serious health impacts too. 

Our cities are being poisoned by a toxin that surrounds us day and night. It eats away at our brains, hurts our hearts, clutches at our sleep, and gnaws at the quality of our daily lives.

Hardly a silent killer, it gets short shrift compared to the well-publicised terrors of air pollution and sugars food. It is the dull, thumping, stultifying drum-beat of perpetual noise.

The score that accompanies city life is brutal and constant. It disrupts the everyday: The coffee break ruined by the screech of a line of double decker buses braking at the lights. The lawyer’s conference call broken by drilling as she makes her way to the office. The writer’s struggle to find a quiet corner to pen his latest article.

For city-dwellers, it’s all-consuming and impossible to avoid. Construction, traffic, the whirring of machinery, the neighbour’s stereo. Even at home, the beeps and buzzes made by washing machines, fridges, and phones all serve to distract and unsettle.

But the never-ending noisiness of city life is far more than a problem of aesthetics. A growing body of evidence shows that noise can have serious health impacts too. Recent studies have linked noise pollution to hearing loss, sleep deprivation, hypertension, heart disease, brain development, and even increased risk of dementia.

One research team compared families living on different stories of the same building in Manhattan to isolate the impact of noise on health and education. They found children in lower, noisier floors were worse at reading than their higher-up peers, an effect that was most pronounced for children who had lived in the building for longest.

Those studies have been replicated for the impact of aircraft noise with similar results. Not only does noise cause higher blood pressure and worsens quality of sleep, it also stymies pupils trying to concentrate in class.

As with many forms of pollution, the poorest are typically the hardest hit. The worst-off in any city often live by busy roads in poorly-insulated houses or flats, cheek by jowl with packed-in neighbours.

The US Department of Transport recently mapped road and aircraft noise across the United States. Predictably, the loudest areas overlapped with some of the country’s most deprived. Those included the south side of Atlanta and the lowest-income areas of LA and Seattle.

Yet as noise pollution grows in line with road and air traffic and rising urban density, public policy has turned a blind eye.

Council noise response services, formally a 24-hour defence against neighbourly disputes, have fallen victim to local government cuts. Decisions on airport expansion and road development pay scant regard to their audible impact. Political platforms remain silent on the loudest poison.

This is odd at a time when we have never had more tools at our disposal to deal with the issue. Electric Vehicles are practically noise-less, yet noise rarely features in the arguments for their adoption. Just replacing today’s bus fleet would transform city centres; doing the same for taxis and trucks would amount to a revolution.

Vehicles are just the start. Millions were spent on a programme of “Warm Homes”; what about “Quiet Homes”? How did we value the noise impact in the decision to build a third runway at Heathrow, and how do we compensate people now that it’s going ahead?

Construction is a major driver of decibels. Should builders compensate “noise victims” for over-drilling? Or could regulation push equipment manufacturers to find new ways to dampen the sound of their kit?

Of course, none of this addresses the noise pollution we impose on ourselves. The bars and clubs we choose to visit or the music we stick in our ears. Whether pumping dance tracks in spin classes or indie rock in trendy coffee shops, people’s desire to compensate for bad noise out there by playing louder noise in here is hard to control for.

The Clean Air Act of 1956 heralded a new era of city life, one where smog and grime gave way to clear skies and clearer lungs. That fight still goes on today.

But some day, we will turn our attention to our clogged-up airwaves. The decibels will fall. #Twitter will give way to twitter. And every now and again, as we step from our homes into city life, we may just hear the sweetest sound of all. Silence.

Adam Swersky is a councillor in Harrow and is cabinet member for finance. He writes in a personal capacity.