According to the news item, what is on the top list of the contributions to poll

A panel of 27 experts with the UN Environment Program looked through previous UN reports to assess what economic activities generate the most pollution and use the most resources.
    Most of the data comes from the industrialized world. Not surprisingly, burning fossil fuels for transportation and electrical generation top the list for their contributions to climate change, acid rain and toxic pollution.
    But the report singles out food production as the other major factor driving environmental degradation. Raising livestock and clearing land for farms and ranches are significant greenhouse-gas emitters. Fertilizers and pesticides are the largest contributors to water pollution. And the world’ s insatiable appetite is depleting the planet’s fisheries and using up land and fresh water at an alarming rate.
    The growing demand for meat and dairy products is putting particular strain on the environment. According to co-author Sangwon Suh at the University of California, Santa Barbara "In order to raise cattle, basically you need to consume a lot of feed, and in order to produce feed, you need to use land, fertilizers and agrochemicals which, in turn, affect our environment."
    The report concludes that, "A substantial reduction of impacts would only be possible with a substantial worldwide diet change, away from animal products. "