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在斯德哥爾摩參加世界水大會(huì)的科學(xué)家們發(fā)布的一份報(bào)告稱，未來(lái)40年全球人口可能要轉(zhuǎn)成純素食習(xí)慣才能避免食品短缺產(chǎn)生的災(zāi)難性影響。該報(bào)告指出，到2050年，全球人口有望達(dá)到90億，如果人類繼續(xù)目前的飲食習(xí)慣，屆時(shí)地球上將沒(méi)有足夠的水資源供農(nóng)作物生長(zhǎng)來(lái)養(yǎng)活這些人。目前，人類從動(dòng)物食品中獲取的蛋白質(zhì)占20%，到2050年，這一比例將可能下降至5%。研究人員指出，動(dòng)物蛋白類食品消耗的水資源是素食食品的5到10倍，全球有三分之一的耕地都用來(lái)種植動(dòng)物飼料。人類轉(zhuǎn)向素食習(xí)慣不但可以節(jié)約水資源，還能讓更多耕地真正用于糧食生產(chǎn)，應(yīng)對(duì)食品危機(jī)。自今年6月以來(lái)，受美俄干旱以及亞洲降雨減少等因素影響，全球玉米和小麥價(jià)格已上漲了近50%，未來(lái)五年有可能出現(xiàn)一次全球性食品危機(jī)。

Humans derive about 20% of their protein from animal-based products now, but this may need to drop to just 5% to feed the extra 2 billion people expected to be alive by 2050, according to research by some of the world's leading water scientists.

Leading water scientists have issued one of the sternest warnings yet about global food supplies, saying that the world's population may have to switch almost completely to a vegetarian diet over the next 40 years to avoid catastrophic shortages.

Humans derive about 20% of their protein from animal-based products now, but this may need to drop to just 5% to feed the extra 2 billion people expected to be alive by 2050, according to research by some of the world's leading water scientists.

"There will not be enough water available on current croplands to produce food for the expected 9 billion population in 2050 if we follow current trends and changes towards diets common in western nations," the report by Malik Falkenmark and colleagues at the Stockholm International Water Institute (SIWI) said.

"There will be just enough water if the proportion of animal-based foods is limited to 5% of total calories and considerable regional water deficits can be met by a … reliable system of food trade."

Dire warnings of water scarcity limiting food production come as Oxfam and the UN prepare for a possible second global food crisis in five years. Prices for staples such as corn and wheat have risen nearly 50% on international markets since June, triggered by severe droughts in the US and Russia, and weak monsoon rains in Asia. More than 18 million people are already facing serious food shortages across the Sahel.

Oxfam has forecast that the price spike will have a devastating impact in developing countries that rely heavily on food imports, including parts of Latin America, North Africa and the Middle East. Food shortages in 2008 led to civil unrest in 28 countries.

Adopting a vegetarian diet is one option to increase the amount of water available to grow more food in an increasingly climate-erratic world, the scientists said. Animal protein-rich food consumes five to 10 times more water than a vegetarian diet. One third of the world's arable land is used to grow crops to feed animals. Other options to feed people include eliminating waste and increasing trade between countries in food surplus and those in deficit.

"Nine hundred million people already go hungry and 2 billion people are malnourished in spite of the fact that per capita food production continues to increase," they said. "With 70% of all available water being in agriculture, growing more food to feed an additional 2 billion people by 2050 will place greater pressure on available water and land."

The report is being released at the start of the annual world water conference in Stockholm, Sweden, where 2,500 politicians, UN bodies, non-governmental groups and researchers from 120 countries meet to address global water supply problems.

Competition for water between food production and other uses will intensify pressure on essential resources, the scientists said. "The UN predicts that we must increase food production by 70% by mid-century. This will place additional pressure on our already stressed water resources, at a time when we also need to allocate more water to satisfy global energy demand – which is expected to rise 60% over the coming 30 years – and to generate electricity for the 1.3 billion people currently without it," said the report.

Overeating, undernourishment and waste are all on the rise and increased food production may face future constraints from water scarcity.

"We will need a new recipe to feed the world in the future," said the report's editor, Anders J?gerskog.

A separate report from the International Water Management Institute (IWMI) said the best way for countries to protect millions of farmers from food insecurity in sub-Saharan Africa and south Asia was to help them invest in small pumps and simple technology, rather than to develop expensive, large-scale irrigation projects.

"We've witnessed again and again what happens to the world's poor – the majority of whom depend on agriculture for their livelihoods and already suffer from water scarcity – when they are at the mercy of our fragile global food system," said Dr Colin Chartres, the director general.

"Farmers across the developing world are increasingly relying on and benefiting from small-scale, locally-relevant water solutions. [These] techniques could increase yields up to 300% and add tens of billions of US dollars to household revenues across sub-Saharan Africa and south Asia."

相關(guān)閱讀

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(Agencies)

（中國(guó)日?qǐng)?bào)網(wǎng)英語(yǔ)點(diǎn)津 Helen 編輯）