Encouragingly, the explosive growth of global travel has put tourism again in the spotlight, which is why the United Nations has made 2002 the year of ecotourism, for the first time to bring to the world's attention, the benefits of tourism, but also its capacity to destroy our ecoenvironment.

解答：

第一个问题：for the first time to这句是什么结构呢？这句话的主语又在哪里呢？

for the first time to bring...不定式短语是主句的结果状语。其逻辑主语就是主句的主语。

第二个问题：the benefits of tourism, 这里是插入语还是 attention 的同位语呢？

the benefits of toourism是to bring的宾语，to the world's attention是bring的状语，由于bring有两个宾语，因此宾语后移。

第三个问题：but also its capacity，想说句型不是 not only ... but also 吗？那他的句型不完整啊，同时如果要是并列不应该成分相同么， its capacity 是名词，那个并列的成分在哪里呢？

but also its capacity to destroy our ecoenvironment是bring的第二个宾语。but also不一定非得呼应bot only, 可以单独使用。

不知为何无人回答此问题。我作了回答。应该是正确的解答。请管理员酌情关闭此问题或采纳。