The above question wants to analyze your writing ability. For that reason, it is not right for me to write the article and the speech for you, but I will show you how to write them.
First, you must research an environmental problem, the impacts that the problem causes, the possible consequences, and how to solve it.
After performing this search on reputable sources. You can write the article as follows:
Introduction: Present the environmental issue you want to expose and share your opinion on that issue. That opinion will be your thesis statement.
Body: Write at least two paragraphs. In these paragraphs, you will show arguments that complement and explain your thesis statement, that show the relevance of the environmental problem and that explain why this problem should be solved.
Conclusion: Reinforce your thesis statement and summarize the arguments presented.
After that, you will be able to write your speech, which should be an informative speech, that is, you will not show opinions or arguments and will only present the environmental problem that you researched.
You can write this speech as follows:
Introduce the environmental problem.
Show how it is caused.
Show the impacts it causes.
Show the consequences.
Show the seriousness of the environmental problem.
Show how to solve it.