. >> jacobo arango is a plant scientist and ipcc author from colombia. >> the first one is in developede people may choose what they eat, there is at least another reality for developing countries. >> where people are struggling for nutrients, animal protein can make a big difference. and beefing up our beef production can help. but what''s the best way? very simply speaking, there are two ways of raising cattle. one is grass-fed farms, like this one in northern germany, run by heiko gluth. ♪ >>. in the summer, the cows eat grass straight from the pastorate like you see here. and then in the winter when the , grass obviously isn't growing, the animals eat homegrown hay. >> this is a small operation - right now there are 58 animals here, 80 in the spring. >> these ones here in the front, these are calves from this year, the four. that one is two and a half years old. yes, and the next one to go. and that means a sale weight of around 300 kilos of meat. >> they roam around 160 hectares and have a warm barn for the winter. raising cattle looks similar to this in many places in the world. a