I have to present a persuasive speech tomorrow, but I need specific points instead of just examples.
These Days, many controversies are going on about global warming, extinction and lack of resources. We worry about our future generations ....
A persuasive speech is supposed to convince your audience to take a position or take action about a specific topic. Based on your introductory paragraph, you have nothing specific about which you want to convince them; however, you do have three animals (your body points, of course) which you say are being routinely killed and mistreated due to people's greed. What you are missing is a clear, understandable thesis statement.
A thesis statement (sometimes called a purpose statement) is one clear sentence which encapsulates your position and previews your three points. For example, you might say something like this: Because man has chosen to satisfy his own selfish wants and desires, sharks, rhinoseroses, and elephants are routinely being killed. Note the strong persuasive language and the clear preview of the three animals you want to talk about.
Looking at your points, I might also suggest that you change the order to have a stronger speech. The general rule about this is to move from the least to most important (or the weakest to the strongest argument). This ensures that you finish your speech with the point that will have the greatest impact. In this case, perhaps it is the section on sharks. The elephant section seems weakest, so it should probably go first.
Remember to review your thesis/purpose statement in your conclusion, as well. This serves as a reminder of the three things you discussed. I do sense your passion, so be sure to use accurate but persuasive language to really let your audience see how strongly you feel about this topic. Best of luck on your speech!