I am struggling to prepare a environmental concern speech that must consist of 2-minutes' worth of writing. In fact, I am torn and conflicted about which concern to chose: deforestation, pollution, or neglect of nature. What do you think? Which do you think will be the greatest topic? If anyone could make any suggestions, then be willing to help me afterwards, I would greatly appreciate it.

I'd go with deforestation ... it seems to include both pollution and a type of neglect.

http://environment.nationalgeographic.com/environment/global-warming/deforestation-overview/

http://www.livescience.com/27692-deforestation.html