So if you look at the people

如果你关注那些仅仅对
that are interested just in the issue of sustainability;

可持续发展能力感兴趣的人
you have people that are concerned about the environment;

你会发现他们有的担心环境问题
you have people that are concerned about biodiversity;

有的担心生物多样性
people concerned about animal welfare;

有的关心动物福利
and then of course you got the whole public health overlay with

当然还有在整个公共卫生层面
people concerned about the effects of food

那些担心食物
on physical and mental well being in people.

对人身心健康的影响的人
All these different philosophies or conceptual approaches are passions

这些不同的哲学概念都是源于
that people have get played out in different ways people organize,

不同的组织方式下人们所迸发出的热情
so there are different groups that represent each of these different areas.

所以有不同团体代表着不同的层面
One thing that hasn't happened is that

有一件事情还未发生那就是